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A Prime number is an integer that can not be written as a product of two or more integers.

For instance:

6 = 2 x 3, so it is not a prime number.

27 = 9 x 3, so it is not a prime number

105 = 5 x 21 = 3 x 5 x 7, so it is not a prime number

23 can not be written as a product of integers, so it is a prime number.

All even numbers are prime numbers, because they can be written as multiple of 2.

61 is a prime number, 62 is not, 63 is not, 64 is not, 65 is not, 66 is not, 67 is, etc...

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