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What are the prime factors of 15?

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.