So in light of these facts, we just declare the number 1 to not be a prime. Zero is neither a positive number nor a negative number. Infinity is thought of as a kind of loop, so you eventually would wind up where you started. But zero is a number. Infinity is not.
Infinity is big.
Zero is not. There are two subdivisions of the real numbers. They are either rational or irrational. The set of integers lies within the set of rational numbers. Integers are just positive or negative whole numbers.