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{{ printedBook.courseTrack.name }} {{ printedBook.name }} The set of **prime numbers**, represented by the symbol $P,$ is formed by all natural numbers that have exactly one divisor *other than* $1.$ The set contains infinitely many numbers.
$P={2,3,5,7,11…} $
In other words, a prime number is a natural number with exactly two positive factors: $1$ and itself.

Number | Factors | Prime? |
---|---|---|

$5$ | $1⋅5$ | $✓$ |

$6$ | $1⋅2⋅3$ | $×$ |

$7$ | $1⋅7$ | $✓$ |