Yes it is.
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It isn't. The square of any real number is positive. (negative 9)2 = positive 81. Did you mean negative (92) ? Well, 92 = 81, and the negative of that is negative 81.
You do nothing. A negative number is a whole number.
6 is a whole number -47.03 is a negative number -179 is a negative whole number
Yes, it is.
They can be. For example, -3 is a negative whole number.