there are integers that 7 may be multiplied by to reach the values of 14, 49, 0 and -21, while there are no such integers for 3 and -6. Each of the products listed below, and in particular, the products for 3 and -6, is the only way that the relevant number can be written as a product of 7 and another real number:
:
:
:
:
: is not an integer;
: is not an integer.

Properties

* 0 is a multiple of every number ().
* The product of any integer and any integer is a multiple of . In particular,

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