To find the prime factorization start with any two factors of 198 and keep factoring the composite factors until all factors are prime.
198
2 x 99
2 x 3 x 33
2 x 3 x 3 x 11 = 198
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53 is a prime number so there is no relevant prime factorization for it.
198 99,2 33,3,2 11,3,3,2
prime factorization
the prime factorization
A factor free is a diagram showing the prime factorization of a number.