I head a loud popping sound in my right hand followed by a crack, my fingers have been numb and I can close my hand half way before it starts to hurt?

Go see family doctor. You didn't describe what you were doing when this happened but assuming that you injured yourself, you need an x-ray to look for broken bone(s). At the very least, get evaluated looking for nerve damage. Otoh, many people can "crack their knuckles" w/o any pain. But if it hurts & causes numbness, it's time to get evaluated. Good luck!