Q: What are the prime factors of the number 991,683?

 A: 3, 7, 11, 53

Why are those the prime factors of the number 991,683?

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 991,683

991,683
Factor Arrows
3330,561
Factor Arrows
3110,187
Factor Arrows
336,729
Factor Arrows
312,243
Factor Arrows
34,081
Factor Arrows
7583
Factor Arrows
1153

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, 7, 11, 53

We can check our work by multiplying all of the prime factors together: 3 x 3 x 3 x 3 x 3 x 7 x 11 x 53 = 991,683

This can also be written as 35 x 71 x 111 x 531 = 991,683

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


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