This is probably an Algebra or Discrete or number theory problem, but Ill help anyway.

I hope you know modular arithmetic if you were assigned this problem

Reduce mod 13 and see if it is 0 mod 13 or not.

(mod 13)

(mod 13)

Now I suggest calculating the orders of these guys mod 13.

(mod 13)

Similarly

(mod 13)

(mod 13)

(mod 13)

(mod 13)

so Finally

(mod 13)

but if it were divisible by 13 it should be 0 mod 13, so it is not divisible.

You need to check these calculations, I did them very quickly, so they may be unreliable, but that should at least give you an idea.