Not if you want a whole number as the result. 205 / 10 = 20.5
Yes. 205 / 5 = 41
The numbers which are multiples of 205 (eg 410)
361,415
Do the division! If you get an integer (i.e., no decimals), then it is divisible.
Yes. 205 is divisible by 5, so it is composite.