Question

Why is -3 an integer?

Answer 1

An integer, also called a "round number" or “whole number,” is any positive or negative number that does not include decimal parts or fractions.

Therefore -3 is an integer, but 2.76 or 3 1/2 aren’t.

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Answer 2

For example, -7 is an integer, so it is also a rational and a real number. The square root of 2 is an irrational number, so it is also a real number.