A number with only two factors, 1 and itself, is a prime number.
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A number with only two factors - 1 and itself - is known as a prime number.
A prime number.
13 is a Prime number because it has only two factors which are itself and one
It is 103 which is a prime number because it has only two factors which are itself and one
773 is a prime number because it has only two factors which are itself and one