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1. Find out which numbers multiply together to reach the target number, then find out which numbers multiply together to make the numbers that multiply together to reach the target number.
Prime Factorization is finding which prime numbers multiply together to make the original number.
Multiply together two or more prime numbers.
13*31=403 13 and 31 are prime numbers.
Prime factorization of 99 = 3 * 3 * 11