Q: What is the prime factorization of the number 6,606,528?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 3 x 19 x 1,811
    • or also written as { 2, 2, 2, 2, 2, 2, 3, 19, 1,811 }
  • Written in exponential form: 26 x 31 x 191 x 1,8111

Why is the prime factorization of 6,606,528 written as 26 x 31 x 191 x 1,8111?

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 6,606,528

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 6,606,528 by 2

6,606,528 ÷ 2 = 3,303,264 - No remainder! 2 is one of the factors!
3,303,264 ÷ 2 = 1,651,632 - No remainder! 2 is one of the factors!
1,651,632 ÷ 2 = 825,816 - No remainder! 2 is one of the factors!
825,816 ÷ 2 = 412,908 - No remainder! 2 is one of the factors!
412,908 ÷ 2 = 206,454 - No remainder! 2 is one of the factors!
206,454 ÷ 2 = 103,227 - No remainder! 2 is one of the factors!
103,227 ÷ 2 = 51,613.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
103,227 ÷ 3 = 34,409 - No remainder! 3 is one of the factors!
34,409 ÷ 3 = 11,469.6667 - There is a remainder. We can't divide by 3 evenly anymore. Let's try the next prime number
34,409 ÷ 5 = 6,881.8 - This has a remainder. 5 is not a factor.
34,409 ÷ 7 = 4,915.5714 - This has a remainder. 7 is not a factor.
34,409 ÷ 11 = 3,128.0909 - This has a remainder. 11 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
34,409 ÷ 19 = 1,811 - No remainder! 19 is one of the factors!
1,811 ÷ 19 = 95.3158 - There is a remainder. We can't divide by 19 evenly anymore. Let's try the next prime number
1,811 ÷ 23 = 78.7391 - This has a remainder. 23 is not a factor.
1,811 ÷ 29 = 62.4483 - This has a remainder. 29 is not a factor.
1,811 ÷ 31 = 58.4194 - This has a remainder. 31 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
1,811 ÷ 1,811 = 1 - No remainder! 1,811 is one of the factors!

The orange divisor(s) above are the prime factors of the number 6,606,528. If we put all of it together we have the factors 2 x 2 x 2 x 2 x 2 x 2 x 3 x 19 x 1,811 = 6,606,528. It can also be written in exponential form as 26 x 31 x 191 x 1,8111.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 6,606,528.

6,606,528
Factor Arrows
23,303,264
Factor Arrows
21,651,632
Factor Arrows
2825,816
Factor Arrows
2412,908
Factor Arrows
2206,454
Factor Arrows
2103,227
Factor Arrows
334,409
Factor Arrows
191,811

More Prime Factorization Examples

6,606,5266,606,5276,606,5296,606,530
21 x 3,303,26316,606,52717331 x 9,013121 x 51 x 71 x 94,3791

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