A prime number.
A prime number
A prime number has exactly two factors.
Prime numbers. Their only two factors are 1 and themselves.
Prime numbers have exactly two factors.
Prime numbers have exactly two factors.
A prime number is a whole number with exactly two factors: 1 and itself.
A number that has exactly two (positive) factors is called a prime number. For instance, the only factors of 7 are 1 and 7.
A prime number.
A number with more than two factors is a composite number. A number with exactly two factors is a prime number.
A prime number has exactly two factors: itself and 1.
A prime number