If you drop a gum wrapper on the floor is that pollution why or why not

I don't believe so, it's littering, pollution is when there is bad air quality such as from buildings that have smoke to go in the air or disael, or gas from cars. But I guess It could also be considered pollution since its polluting the earth.
hope this helps!

Well, I don't think it is if it doesn't end up outside.  Because it's in a building, it shouldn't hurt anything from the outside.  Like your home, would you consider it pollution?  Some call it littering, which it is, but not pollution.  If anything it's inside the building, the building could be, but the wrapper would be inside.