Q: What are the prime factors of the number 561,216?

 A: 2, 3, 37, 79

Why are those the prime factors of the number 561,216?

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 561,216

561,216
Factor Arrows
2280,608
Factor Arrows
2140,304
Factor Arrows
270,152
Factor Arrows
235,076
Factor Arrows
217,538
Factor Arrows
28,769
Factor Arrows
32,923
Factor Arrows
3779

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, 37, 79

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 3 x 37 x 79 = 561,216

This can also be written as 26 x 31 x 371 x 791 = 561,216

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


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