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# Difference between revisions of "Factor"

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A '''factor''' is one of the numbers or expressions that make up another number by [[multiplication]]. Let a and b be integers. Then a divides b (which may be written a | b ) if there is an integer c such that a * c = b. It is then said that c and a are factors or divisors of b, that b is divisible by c, and that b is a multiple of c. | A '''factor''' is one of the numbers or expressions that make up another number by [[multiplication]]. Let a and b be integers. Then a divides b (which may be written a | b ) if there is an integer c such that a * c = b. It is then said that c and a are factors or divisors of b, that b is divisible by c, and that b is a multiple of c. | ||

− | A number that has no factors other than itself and 1 is a [[prime | + | A number that has no factors other than itself and 1 is a [[prime]] number, and a number that has factors other than itself and 1 is called a [[composite number]]. |

==See also== | ==See also== |

## Latest revision as of 19:03, 5 February 2019

A **factor** is one of the numbers or expressions that make up another number by multiplication. Let a and b be integers. Then a divides b (which may be written a | b ) if there is an integer c such that a * c = b. It is then said that c and a are factors or divisors of b, that b is divisible by c, and that b is a multiple of c.

A number that has no factors other than itself and 1 is a prime number, and a number that has factors other than itself and 1 is called a composite number.