The factors of 2486 are:
1 2 11 22 113 226 1243 2486
The prime factors are: 2 x 11 x 113
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The prime factors of 51 are 3 and 17. Once you add itself and one, you have all the factors. (1,3,17,51)
That's a prime factorization.
248 = 2 x 2 x 2 x 31
It's not, because all the factors of 20 aren't prime.
Somewhere in front of you was a list of numbers. The instructions were asking you to break down the numbers and write them as a product of their prime factors. This is known as the prime factorization. The prime factorization of 30 is 2 x 3 x 5.