The factors of 391 are: 1 17 23 391 The prime factors are: 17 x 23
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A prime number is a number with two and only two factors: 1 (also known as unity) and itself. A composite number is a number with more than two factors; in other words, it has at least one factor besides 1 and itself. 391 has factors other than 1 and itself, so it is not a prime number. For example, it is divisible by 17. Therefore, 391 is a composite number.
1, 3, 13, 17, 23, 39, 51, 69, 221, 299, 391, 663, 897, 1173, 5083, 15249 3, 13, 17 and 23 are prime.
391
Factors of 391: 1, 17, 23, and 391.Factors of 696: 1, 2, 3, 4, 6, 8, 12, 24, 29, 58, 87, 116, 174, 232, 348, and 696.The only whole number that goes into both 391 and 696 evenly is ' 1 ' .
Because you can not divide it into anything. Another answer: What is 17 times 23?