Q: What are the prime factors of the number 40,192?

 A: 2, 157

Why are those the prime factors of the number 40,192?

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 40,192

40,192
Factor Arrows
220,096
Factor Arrows
210,048
Factor Arrows
25,024
Factor Arrows
22,512
Factor Arrows
21,256
Factor Arrows
2628
Factor Arrows
2314
Factor Arrows
2157

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, 157

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 157 = 40,192

This can also be written as 28 x 1571 = 40,192

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


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