What are multiples and diVisors:

A multiple of a given integer is the product of that integer with some other integer. Thus $k$ is a multiple of $m$ only if $k$ can be written in the form $mn$, where $m$ and $n$ are integers. (In this case, $k$ is a multiple of $n$, as well).

Every nonzero integer has an infinite number of multiples. As an example, some of the multiples of 15 are 15, 30, 45, 60, and 75.

An equivalent phrasing is that $k$ is a multiple of $m$ exactly when $k$ is divisble by $m$.

In Modular Arithmetic, multiples of the modulus, are congruent to 0

See also