3 x 19 = 57
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49 is not prime - its prime factorization is 72. 57 is not prime - its prime factorization is 19 x 3.
It is 31 and 191
No, 3x5x4 is not a prime factorization of 60. A prime factorization of 60 would consist of only prime numbers. The prime factorization of 60 is 2x2x3x5.
When all the factors are prime numbers, that's a prime factorization.
Prime factorization!