5 x 5 x 5 = 125
15 is not a prime number, so it can't be a prime factor.
3 is prime 15 is composite
3*5 = 15 in prime numbers
The prime factors of 15 are 3 and 5.
5 is but 15 is not a prime number
The prime factors of 15 are 3 and 5 because 3 and 5 are prime numbers that divide evenly into 15. 1 is a factor of 15, but it is not a prime number.
15 is not prime, so they cannot be.
The prime factors of 15 are: 3, 5
15 is a factor of 45, but it is not a prime number.
The prime factors of 15 are 3 and 5.
7 is already prime. The prime factorization of 15 is 3 x 5.