hello. I would like to ask for help..

How do I handle this exercise?

Specify the all positive integers $\displaystyle d$, for which it is true to say: For any positive integer $\displaystyle n$, if $\displaystyle n^{4}$ is divisible by $\displaystyle d$, then the number $\displaystyle n^{3}$ is divisible by $\displaystyle d$.