720 Divide by two.
360,2 Divide by two.
180,2,2 Divide by two.
90,2,2,2 Divide by two.
45,2,2,2,2 Divide by three.
15,3,2,2,2,2 Divide by three.
5,3,3,2,2,2,2 Stop.
2 x 2 x 2 x 2 x 3 x 3 x 5 = 720
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91=13x7
2*7*7
prime factorization is the factorization of numbers
how do i get the prime factorization of 45
13 is a prime, so its prime factorization is: 13