Prime numbers
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Numbers that have only 2 factors are prime numbers
A number will always have 1 and itself as factors. And thus the only numbers with 2 factors will be prime numbers. The only prime numbers below 20 are 2, 3, 5, 7, 11, 13, 17 and 19, and thus these are the only numbers below 20 that have 2 factors.
Prime numbers have only two factors.
If they are prime numbers only 2 factors but if they are composite number they will have more than 2 factors
Prime numbers have exactly two factors.All prime numbers have only 2 factors whereas composite numbers have more than 2 factors