Prime factirization of 72 is 2 x 2x 2 x 3 x 3.
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72 36,2 18,2,2 9,2,2,2 3,3,2,2,2
The prime factorization of 72 is 23 x 32.
9x2x2x2 = 9 x 8 = 72 but it's not the prime factorization of 72 as 9=3x3 The prime factorization of 72 is 2x2x2x3x3 = 2^3 x 3^2
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49 is not prime - its prime factorization is 72. 57 is not prime - its prime factorization is 19 x 3.