72
= 49
49/7
= 7
-----------so, not prime as the factors of 72 are 7 * 7, but 49 is divisible by more than itself and 1; it is divisible by 7
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That's the prime factorization of 2100.
The Answer Is 120 :P -Kris
7 and 13 are already prime, no factorization required.
56
The prime factorization of 287 is 7*41.