Not necessarily.
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an exact decimal must be with the number 0. in it or it is not exact.
No. 12 would be a whole number, or 13 would be a whole number, but 12.5 is 12 and 1/2, which is NOT a "whole" number.
There is no "exact". It is infinite.
45/5 is equivalent to a whole number.45/5 is equivalent to a whole number.45/5 is equivalent to a whole number.45/5 is equivalent to a whole number.
No it is not a whole number