Q: What is the prime factorization of the number 1,874,944?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 1,831
    • or also written as { 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1,831 }
  • Written in exponential form: 210 x 1,8311

Why is the prime factorization of 1,874,944 written as 210 x 1,8311?

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 1,874,944

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 1,874,944 by 2

1,874,944 ÷ 2 = 937,472 - No remainder! 2 is one of the factors!
937,472 ÷ 2 = 468,736 - No remainder! 2 is one of the factors!
468,736 ÷ 2 = 234,368 - No remainder! 2 is one of the factors!
234,368 ÷ 2 = 117,184 - No remainder! 2 is one of the factors!
117,184 ÷ 2 = 58,592 - No remainder! 2 is one of the factors!
58,592 ÷ 2 = 29,296 - No remainder! 2 is one of the factors!
29,296 ÷ 2 = 14,648 - No remainder! 2 is one of the factors!
14,648 ÷ 2 = 7,324 - No remainder! 2 is one of the factors!
7,324 ÷ 2 = 3,662 - No remainder! 2 is one of the factors!
3,662 ÷ 2 = 1,831 - No remainder! 2 is one of the factors!
1,831 ÷ 2 = 915.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
1,831 ÷ 3 = 610.3333 - This has a remainder. 3 is not a factor.
1,831 ÷ 5 = 366.2 - This has a remainder. 5 is not a factor.
1,831 ÷ 7 = 261.5714 - This has a remainder. 7 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
1,831 ÷ 1,831 = 1 - No remainder! 1,831 is one of the factors!

The orange divisor(s) above are the prime factors of the number 1,874,944. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 1,831 = 1,874,944. It can also be written in exponential form as 210 x 1,8311.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 1,874,944.

1,874,944
Factor Arrows
2937,472
Factor Arrows
2468,736
Factor Arrows
2234,368
Factor Arrows
2117,184
Factor Arrows
258,592
Factor Arrows
229,296
Factor Arrows
214,648
Factor Arrows
27,324
Factor Arrows
23,662
Factor Arrows
21,831

More Prime Factorization Examples

1,874,9421,874,9431,874,9451,874,946
21 x 311 x 30,241132 x 71 x 29,761151 x 374,989121 x 31 x 2111 x 1,4811

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