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15 is a whole number that has two prime factors: **3 and 5.**

The prime factorization of 15 is equal to:**3*5.**

if a prime number is a factor of a natural number then that prime number is called prime factor of that natural number.

In arithmetic (maths) all the positive integers greater than 2 that are not prime numbers are called composite numbers,

they have at least two prime factors so 15 is a composite number with exactly two(2) prime factors.

**Remark:** The multiplication of all the prime factors of 15 gives a product that is equal to 15: **3*5=15**.

The prime factorization of 15 is equal to:

if a prime number is a factor of a natural number then that prime number is called prime factor of that natural number.

In arithmetic (maths) all the positive integers greater than 2 that are not prime numbers are called composite numbers,

they have at least two prime factors so 15 is a composite number with exactly two(2) prime factors.