No because they can also be positive numbers
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It is because of the way in which positive and negative numbers are defined.
The additive inverse of EVERY positive rational number is a negative number.
Every counting number, and the negative of it, are real, rational integers.
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.
Every integer is a rational number.