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Factoring:
518 = 2 * 259
Since 518 is even (it ends in 8, which is even) I know I can divide by 2.
518 = 2 * 7 * 37
Changing 259 into prime factors takes some work. Start by trying to divide it by 2, then 3, then 5, then 7 etc. Once you divide by 7 and get 37, that's as far as you can go. 37 is a Prime number and cannot be factored any further.
The prime factors of 518 are: 2, 7, 37.
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