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Is 391 prime?

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The number 391 is a composite number because 391 can be divided by one, by itself and at least by 17 and 23. A composite number is an integer that can be divided by at least another natural number, besides itself and 1, without leaving a remainder (divided exactly).

The factorization or decomposition of 391 = 17•23. Notice that here, it is written in exponential form.

The prime factors of 391 are 17 and 23. It is the list of the integer's prime factors.

The number of prime factors of 391 is 2.

Factor tree or prime decomposition for 391

As 391 is a composite number, we can draw its factor tree:

Here you can find the answer to questions related to: Is 391 prime? or list the factors of 391. By using our online calculator to find the prime factors of any composite number and check if a number is prime or composite. This tool also draws the prime factor tree if the number is factorable and smaller than 16000.

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What is prime number? How to factorize a number?

Watch this video below to learn more on prime numbers, prime factors and how you can draw a factor tree.

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