Q: What is the prime factorization of the number 2,946,304?

 A:
  • The prime factors are: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 17 x 677
    • or also written as { 2, 2, 2, 2, 2, 2, 2, 2, 17, 677 }
  • Written in exponential form: 28 x 171 x 6771

Why is the prime factorization of 2,946,304 written as 28 x 171 x 6771?

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 2,946,304

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 2,946,304 by 2

2,946,304 ÷ 2 = 1,473,152 - No remainder! 2 is one of the factors!
1,473,152 ÷ 2 = 736,576 - No remainder! 2 is one of the factors!
736,576 ÷ 2 = 368,288 - No remainder! 2 is one of the factors!
368,288 ÷ 2 = 184,144 - No remainder! 2 is one of the factors!
184,144 ÷ 2 = 92,072 - No remainder! 2 is one of the factors!
92,072 ÷ 2 = 46,036 - No remainder! 2 is one of the factors!
46,036 ÷ 2 = 23,018 - No remainder! 2 is one of the factors!
23,018 ÷ 2 = 11,509 - No remainder! 2 is one of the factors!
11,509 ÷ 2 = 5,754.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number
11,509 ÷ 3 = 3,836.3333 - This has a remainder. 3 is not a factor.
11,509 ÷ 5 = 2,301.8 - This has a remainder. 5 is not a factor.
11,509 ÷ 7 = 1,644.1429 - This has a remainder. 7 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
11,509 ÷ 17 = 677 - No remainder! 17 is one of the factors!
677 ÷ 17 = 39.8235 - There is a remainder. We can't divide by 17 evenly anymore. Let's try the next prime number
677 ÷ 19 = 35.6316 - This has a remainder. 19 is not a factor.
677 ÷ 23 = 29.4348 - This has a remainder. 23 is not a factor.
677 ÷ 29 = 23.3448 - This has a remainder. 29 is not a factor.
...
Keep trying increasingly larger numbers until you find one that divides evenly.
...
677 ÷ 677 = 1 - No remainder! 677 is one of the factors!

The orange divisor(s) above are the prime factors of the number 2,946,304. 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 17 x 677 = 2,946,304. It can also be written in exponential form as 28 x 171 x 6771.

Factor Tree

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 2,946,304.

2,946,304
Factor Arrows
21,473,152
Factor Arrows
2736,576
Factor Arrows
2368,288
Factor Arrows
2184,144
Factor Arrows
292,072
Factor Arrows
246,036
Factor Arrows
223,018
Factor Arrows
211,509
Factor Arrows
17677

More Prime Factorization Examples

2,946,3022,946,3032,946,3052,946,306
21 x 311 x 47,521132 x 4671 x 701151 x 791 x 7,459121 x 31 x 111 x 44,6411

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