Q: What are the prime factors of the number 315,264?

 A: 2, 3, 821

Why are those the prime factors of the number 315,264?

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 315,264

315,264
Factor Arrows
2157,632
Factor Arrows
278,816
Factor Arrows
239,408
Factor Arrows
219,704
Factor Arrows
29,852
Factor Arrows
24,926
Factor Arrows
22,463
Factor Arrows
3821

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, 821

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 821 = 315,264

This can also be written as 27 x 31 x 8211 = 315,264

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


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