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A Prime number has only two factors.
Such is a number is a prime number or a prime. (This is one correct definition of prime.)
A prime number.
A prime number has exactly two factors: 1 and itself.
Not sure about a "problom" but the number is a "prime".
A prime number.
A composite number
A prime number
Prime numbers. Their only two factors are 1 and themselves.
A prime number because it has only two factors.
A number with only two factors - 1 and itself - is known as a prime number.
!7 is a Prime number because it has only two factors which are itself and one
163 is a prime number because it has only two factors which are itself and one