Q: What are the prime factors of the number 218,295?

 A: 3, 5, 7, 11

Why are those the prime factors of the number 218,295?

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 218,295

218,295
Factor Arrows
372,765
Factor Arrows
324,255
Factor Arrows
38,085
Factor Arrows
32,695
Factor Arrows
5539
Factor Arrows
777
Factor Arrows
711

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:

3, 5, 7, 11

We can check our work by multiplying all of the prime factors together: 3 x 3 x 3 x 3 x 5 x 7 x 7 x 11 = 218,295

This can also be written as 34 x 51 x 72 x 111 = 218,295

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


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