Yes, it is all of those things.
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Every whole number is rational and an integer. But the "natural" numbers are definedas the counting numbers, so the negative whole numbers wouldn't qualify.No and yes: it is not a natural number but it is a rational number.
It is rational, whole, integer and real but not natural nor irrational.
It is integer, rational, whole but not natural.
Rational, whole and integer. Some mathematicians consider it a natural number, others do not.
5 is a natural number, as it is an integer greater than zero. It is a whole number, an integer, and a rational number.