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Concept

Prime Numbers

A prime number is a whole number greater than

1

that is only divisible by

1

and the number itself. In other words, the only factors of a prime number are

1

and itself.

Number	Factors	Prime?
$5$	$1$ and $5$	$✓$
$6$	$1,$ $2,$ $3,$ and $6$	$\times$
$7$	$1$ and $7$	$✓$

The set of prime numbers contains infinitely many numbers. These are some important properties of prime and composite numbers.

Prime	Composite
A prime number has only two factors.	A composite number has more than two factors.
The only even prime number is $2 .$	Every even number greater than $2$ is composite.
Any whole number greater than $1$ is either prime or composite.
$1$ is neither prime nor composite.

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