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Here are all the factors of 45: 1; 3; 5; 9; 15; 45
45 has 6 factors or divisors (45 is divisible by each of its factors) because 45 is not a prime number, 45 is a composite number, in arithmetic if an integer bigger than 2 is a composite number, you can calculate it by multiplying at least two prime numbers, that's to say a composite number is a multiple of prime numbers and it has prime numbers among its factors.
Among the factors of 45, 3 and 5 are prime factors. A prime factor is a prime number that is a factor or divisor of an integer.
The prime factorization of 45 is: 3*3*5 = 3^2 * 5
Here are the couple of factors of 45 that you can multiply for finding 45 (the multiplication of each pair of integers gives 45):

1 and 45: 1*45=45; 3 and 15: 3*15=45; 5 and 9: 5*9=45;
Apart from these 3 pairs of integers, we cannot find other pairs of integers whose product makes it possible to find 45.
If an integer f is a factor of 45, we can divide 45 by f to get an integer quotient and zero remainder (example: f=5. 45 divided by 5 gives 9 as quotient and zero remainder. And 9 multiplied by 5 gives 45). The quotient of the division of 45 by f must be one of the factors of 45 (1; 3; 5; 9; 15 or 45). the value of the dividend f must also correspond to one of the divisors (factors) of 45 (1; 3; 5; 9; 15 or 45). That means if you divide 45 by one of its factors, the quotient must be another of its factors and the remainder must be zero.
Here are all the factors of some whole numbers that are not prime numbers (from 430 to 500).

The factors of 430:

1; 2; 5; 10; 43; 86; 215; 430

The factors of 432:

1; 2; 3; 4; 6; 8; 9; 12; 16; 18; 24; 27; 36; 48; 54; 72; 108; 144; 216; 432

The factors of 434:

1; 2; 7; 14; 31; 62; 217; 434

The factors of 435:

1; 3; 5; 15; 29; 87; 145; 435

The factors of 436:

1; 2; 4; 109; 218; 436

The factors of 438:

1; 2; 3; 6; 73; 146; 219; 438

The factors of 440:

1; 2; 4; 5; 8; 10; 11; 20; 22; 40; 44; 55; 88; 110; 220; 440

The factors of 441:

1; 3; 7; 9; 21; 49; 63; 147; 441

The factors of 442:

1; 2; 13; 17; 26; 34; 221; 442

The factors of 444:

1; 2; 3; 4; 6; 12; 37; 74; 111; 148; 222; 444

The factors of 445:

1; 5; 89; 445

The factors of 446:

1; 2; 223; 446

The factors of 447:

1; 3; 149; 447

The factors of 448:

1; 2; 4; 7; 8; 14; 16; 28; 32; 56; 64; 112; 224; 448

The factors of 450:

1; 2; 3; 5; 6; 9; 10; 15; 18; 25; 30; 45; 50; 75; 90; 150; 225; 450

The factors of 452 :

1; 2; 4; 113; 226; 452

The factors of 453 :

1; 3; 151; 453

The factors of 454 :

1; 2; 227; 454

The factors of 455 :

1; 5; 7; 13; 35; 65; 91; 455

The factors of 456 :

1; 2; 3; 4; 6; 8; 12; 19; 24; 38; 57; 76; 114; 152; 228; 456

The factors of 458 :

1; 2; 229; 458

The factors of 459 :

1; 3; 9; 17; 27; 51; 153; 459

The factors of 460 :

1; 2; 4; 5; 10; 20; 23; 46; 92; 115; 230; 460

The factors of 462 :

1; 2; 3; 6; 7; 11; 14; 21; 22; 33; 42; 66; 77; 154; 231; 462

The factors of 464 :

1; 2; 4; 8; 16; 29; 58; 116; 232; 464

The factors of 465 :

1; 3; 5; 15; 31; 93; 155; 465

The factors of 466 :

1; 2; 233; 466

The factors of 468 :

1; 2; 3; 4; 6; 9; 12; 13; 18; 26; 36; 39; 52; 78; 117; 156; 234; 468

The factors of 470 :

1; 2; 5; 10; 47; 94; 235; 470

The factors of 471 :

1; 3; 157; 471

The factors of 472 :

1; 2; 4; 8; 59; 118; 236; 472

The factors of 474 :

1; 2; 3; 6; 79; 158; 237; 474

The factors of 475 :

1; 5; 19; 25; 95; 475

The factors of 476 :

1; 2; 4; 7; 14; 17; 28; 34; 68; 119; 238; 476

The factors of 477 :

1; 3; 9; 53; 159; 477;

The factors of 478 :

1; 2; 239; 478

The factors of 480 :

1; 2; 3; 4; 5; 6; 8; 10; 12; 15; 16; 20; 24; 30; 32; 40; 48; 60; 80; 96; 120; 160; 240; 480

The factors of 482 :

1; 2; 241; 482

The factors of 483 :

1; 3; 7; 21; 23; 69; 161; 483;

The factors of 484 :

1; 2; 4; 11; 22; 44; 121; 242; 484;

The factors of 485 :

1; 5; 97; 485

The factors of 486 :

1; 2; 3; 6; 9; 18; 27; 54; 81; 162; 243; 486

The factors of 488 :

1; 2; 4; 8; 61; 122; 244; 488

The factors of 490 :

1; 2; 5; 7; 10; 14; 35; 49; 70; 98; 245; 490

The factors of 492 :

1; 2; 3; 4; 6; 12; 41; 82; 123; 164; 246; 492

The factors of 494 :

1; 2; 13; 19; 26; 38; 247; 494

The factors of 495 :

1; 3; 5; 9; 11; 15; 33; 45; 55; 99; 165; 495

The factors of 496 :

1; 2; 4; 8; 16; 31; 62; 124; 248; 496

The factors of 498 :

1; 2; 3; 6; 83; 166; 249; 498

The factors of 500 :

1; 2; 4; 5; 10; 20; 25; 50; 100; 125; 250; 500
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