Q: What are the prime factors of the number 2,401,503?

 A: 3, 13, 139, 443

Why are those the prime factors of the number 2,401,503?

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 2,401,503

2,401,503
Factor Arrows
3800,501
Factor Arrows
1361,577
Factor Arrows
139443

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, 13, 139, 443

We can check our work by multiplying all of the prime factors together: 3 x 13 x 139 x 443 = 2,401,503

This can also be written as 31 x 131 x 1391 x 4431 = 2,401,503

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


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