Every number has at least two factors . . . itself, and the number ' 1 ' .
If those are the only factors it has, and no others, then it's a Prime number.
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Numbers that have only 2 factors are prime numbers
All prime numbers have only 2 factors. A prime number has 1 and itself as its only factors.
Prime numbers
Prime numbers have exactly two factors.All prime numbers have only 2 factors whereas composite numbers have more than 2 factors
Prime numbers have only two factors.