Q: What are the prime factors of the number 7,812,500?

 A: 2, 5

Why are those the prime factors of the number 7,812,500?

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 7,812,500

7,812,500
Factor Arrows
23,906,250
Factor Arrows
21,953,125
Factor Arrows
5390,625
Factor Arrows
578,125
Factor Arrows
515,625
Factor Arrows
53,125
Factor Arrows
5625
Factor Arrows
5125
Factor Arrows
525
Factor Arrows
55

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, 5

We can check our work by multiplying all of the prime factors together: 2 x 2 x 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 x 5 = 7,812,500

This can also be written as 22 x 59 = 7,812,500

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


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