2 x 3 x 3
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Prime factorization is the process of determining all of the prime factors of a given number. Prime factors are the prime numbers that when multiplied together give you the number to be factored. For example the prime factorization of 30 is 15 x 2
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