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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The prime factorization of 72 is 23 x 32.
49 is not prime - its prime factorization is 72. 57 is not prime - its prime factorization is 19 x 3.
It is: 23*32 = 72
32 * 72 * 11
49 = 72