21 Prime Factorization

21 prime factorization provides more information on if 21 is a prime number, what are all the prime factors of 21. The given integer 21 is a composite number since it has more factors than 1 and the number itself. In other words, 21 is divisible by more factors than 1 and the number itself.

Prime factors of 21
21 = (?)
21 = 3 x 7

Hence,
{3, 7} are the prime factors of 21.
The product of factors {3, 7} form the given positive integer 21.