Q: What is the prime factorization of the number 1,892,488?

 A:
  • The prime factors are: 2 x 2 x 2 x 13 x 31 x 587
    • or also written as { 2, 2, 2, 13, 31, 587 }
  • Written in exponential form: 23 x 131 x 311 x 5871

Why is the prime factorization of 1,892,488 written as 23 x 131 x 311 x 5871?

What is prime factorization?

Prime factorization or prime factor decomposition is the process of finding which prime numbers can be multiplied together to make the original number.

Finding the prime factors of 1,892,488

To find the prime factors, you start by dividing the number by the first prime number, which is 2. If there is not a remainder, meaning you can divide evenly, then 2 is a factor of the number. Continue dividing by 2 until you cannot divide evenly anymore. Write down how many 2's you were able to divide by evenly. Now try dividing by the next prime factor, which is 3. The goal is to get to a quotient of 1.

If it doesn't make sense yet, let's try it...

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 1,892,488 by 2

1,892,488 ÷ 2 = 946,244 - No remainder! 2 is one of the factors!
946,244 ÷ 2 = 473,122 - No remainder! 2 is one of the factors!
473,122 ÷ 2 = 236,561 - No remainder! 2 is one of the factors!
236,561 ÷ 2 = 118,280.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
236,561 ÷ 3 = 78,853.6667 - This has a remainder. 3 is not a factor.
236,561 ÷ 5 = 47,312.2 - This has a remainder. 5 is not a factor.
236,561 ÷ 7 = 33,794.4286 - This has a remainder. 7 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
236,561 ÷ 13 = 18,197 - No remainder! 13 is one of the factors!
18,197 ÷ 13 = 1,399.7692 - There is a remainder. We can't divide by 13 evenly anymore. Let's try the next prime number
18,197 ÷ 17 = 1,070.4118 - This has a remainder. 17 is not a factor.
18,197 ÷ 19 = 957.7368 - This has a remainder. 19 is not a factor.
18,197 ÷ 23 = 791.1739 - This has a remainder. 23 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
18,197 ÷ 31 = 587 - No remainder! 31 is one of the factors!
587 ÷ 31 = 18.9355 - There is a remainder. We can't divide by 31 evenly anymore. Let's try the next prime number
587 ÷ 37 = 15.8649 - This has a remainder. 37 is not a factor.
587 ÷ 41 = 14.3171 - This has a remainder. 41 is not a factor.
587 ÷ 43 = 13.6512 - This has a remainder. 43 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
587 ÷ 587 = 1 - No remainder! 587 is one of the factors!

The orange divisor(s) above are the prime factors of the number 1,892,488. If we put all of it together we have the factors 2 x 2 x 2 x 13 x 31 x 587 = 1,892,488. It can also be written in exponential form as 23 x 131 x 311 x 5871.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 1,892,488.

1,892,488
Factor Arrows
2946,244
Factor Arrows
2473,122
Factor Arrows
2236,561
Factor Arrows
1318,197
Factor Arrows
31587

More Prime Factorization Examples

1,892,4861,892,4871,892,4891,892,490
21 x 231 x 41,141131 x 2931 x 2,15311,892,489121 x 31 x 51 x 1991 x 3171

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