Q: What are the prime factors of the number 251,160?

 A: 2, 3, 5, 7, 13, 23

Why are those the prime factors of the number 251,160?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 251,160

251,160
Factor Arrows
2125,580
Factor Arrows
262,790
Factor Arrows
231,395
Factor Arrows
310,465
Factor Arrows
52,093
Factor Arrows
7299
Factor Arrows
1323

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 3, 5, 7, 13, 23

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 3 x 5 x 7 x 13 x 23 = 251,160

This can also be written as 23 x 31 x 51 x 71 x 131 x 231 = 251,160

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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