18 = 2 x 3 x 3
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18 is not a prime number so no number can have 18 as a prime factor.
2 is a prime number. 18 is a composite number.
Prime factors of 18 are 2 and 3 Prime factors of 15 are 3 and 5
The prime factorization of 18 is 2 * 3^2
The only two prime factors of 18 are: 2, 3