Yes, it is.
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79 & 81, or any whole number from 1 to 79 with any whole number greater than 81.
Yes it is.
81.46 is a mixed number in decimal form and there is no sensible way to represent it as a whole number. The whole part of it is 81.
Try doing the division, in this case, 81 / 3. If you get a whole number, it is; otherwise it isn't.
Whole numbers means no decimal places have to be represented and no fractions can be associated with it. so 80 is a whole number and the whole number before it is 79 and the whole number after it is 81