By the rules of divisibility, you know that 515 is divisible by 5. 515 divided by 5 is 103. Since both 5 and 103 are prime and can't be divided further, stop there. The prime factorization of 515 is 5 x 103.
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91=13x7
2*7*7
how do i get the prime factorization of 45
prime factorization is the factorization of numbers
13 is a prime, so its prime factorization is: 13