Factors of 40
If a number does not have a factor besides 1 and itself, it is called prime. Example: 5 have no factors, whole numbers that can be divided by evenly, besides 1 and 5. It is therefore prime.20, and the other hand, the factors 1, 2, 4, 5, 10 and 20. Because it's factors besides 1 and itself (2, 4, 5 and 10), it is not prime.
In number theory, the prime factors of a positive integer are the prime numbers that divide that integer exactly, without leaving a remainder.
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