Hi, I have a whirlpool

Question

Hi,

I have a whirlpool side by side refrigerator that will not cool. The light comes on and the fan blows but it will not cool. I tested the compressor relay and it looks to be good. Both the refrigerator and freezer sides will not cool. Therefore I felt that the compressor might be the problem. Is there a good way to check to be sure that the compressor is definitely bad? Or am I looking at the wrong thing in order to find out what the problem is.

Thanks

Ron