Q: What are the prime factors of the number 15,565,312?

 A: 2, 7, 43, 101

Why are those the prime factors of the number 15,565,312?

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 15,565,312

15,565,312
Factor Arrows
27,782,656
Factor Arrows
23,891,328
Factor Arrows
21,945,664
Factor Arrows
2972,832
Factor Arrows
2486,416
Factor Arrows
2243,208
Factor Arrows
2121,604
Factor Arrows
260,802
Factor Arrows
230,401
Factor Arrows
74,343
Factor Arrows
43101

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, 7, 43, 101

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 2 x 2 x 7 x 43 x 101 = 15,565,312

This can also be written as 29 x 71 x 431 x 1011 = 15,565,312

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


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