Natural numbers are separate from integers. I can't believe this was asked 9 years ago . . .
Not whole numbers. Yes to real numbers and integers.
Rational positive numbers
173 belongs to the set of positive natural numbers and it also belongs to the set of prime numbers.
-12 belongs to negative integers
Integers, Rational numbers, Real numbers and Complex numbers.
Integers, rationals, reals, complex numbers, etc.
No. 0 is a numeral but does not belong to the set.
-12 belongs to at least the sets of all numbers, of integers and negative integers, of rational numbers and negative rational numbers, and all negative numbers.