Q: What are the prime factors of the number 1,818,624?

 A: 2, 3, 37

Why are those the prime factors of the number 1,818,624?

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 1,818,624

1,818,624
Factor Arrows
2909,312
Factor Arrows
2454,656
Factor Arrows
2227,328
Factor Arrows
2113,664
Factor Arrows
256,832
Factor Arrows
228,416
Factor Arrows
214,208
Factor Arrows
27,104
Factor Arrows
23,552
Factor Arrows
21,776
Factor Arrows
2888
Factor Arrows
2444
Factor Arrows
2222
Factor Arrows
2111
Factor Arrows
337

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

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 2 x 2 x 2 x 2 x 2 x 3 x 37 = 1,818,624

This can also be written as 214 x 31 x 371 = 1,818,624

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


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