You've got some of that stuff a little wrong. I think you mean that when you **divide** one number by a small number you get a big number. If you **multiply** one number by a small number you get a small number. (We say "multiply," not "times." "Times" is the way you read the multiplication sign "x" out loud, but it's not a verb.) Zero is most definitely not infinite. It is about as finite as you can get. Any number that can be measured is finite, and it's really easy to measure something that you've run out of. Like zero money or beer or gasoline.

So, zero is a number. We have to be able to express any number as the sum of its real component and its imaginary component. Zero = 0+0i. Can't get any more numeric than that. (i = the square root of -1. I don't know how far along you are in your math classes. i is very important in electronics.)

Zero, the symbol "0," is also a numeral. Specifically, what we call an Arabic numeral, from the set 0, 1, 2, 3, 4, etc. The Roman numerals -- I, II, III, IV, etc. -- don't have a zero.