A Prime number can be divided, without a remainder, only by itself and by 1. For example, 17 can be divided only by 17 and by 1.
Some facts:
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Prime numbers are positive integers with only two factors. 2, 3, 5 and 7 are examples of prime numbers.
Numbers that have more than two factors are not prime numbers because prime numbers have only two factors.
All composite numbers are not prime numbers because they have more than two factors
Those are called twin primes. Examples are 11 and 13; or 107 and 109.
Numbers with only two factors, the number itself and one, are called prime numbers. Examples of prime numbers are 2 (which is the only even prime number) and 17.