The prime numbers: 2, 3, 5, 7, 11, 13, 17 and 19.
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They are the numbers that have more than 2 factors in them because a prime number has only 2 factors which are itself and one
Numbers that have only 2 factors are prime numbers
They all have only two factors: one and the number itself.
There are three numbers that fit those requirements.
Prime numbers