Divisible : An integer $x$ is called divisible by an integer $y$ if the division $x:y$ has a remainder of zero. For example 4 is divisible by 2 but 5 is not divisible by 2.

Divisible by 5 : An integer $x$ is called divisible by 5 if $x$ is a multiple of 5. An integer is divisible by 5 if and only if it ends in a 0 or a 5.

Number : A number $x$ is a mathematical symbol representing a quantity.