Yes.
84 already is a whole number.
This depends what you are rounding by. To the nearest whole number it would be 84.
83.798 rounded to the nearest whole number is 84.
84
It is 84.
84
83.7326 rounded to the nearest whole number is 84
21
It is: 84
If the last digit is an even number, the whole number is an even number.
It is: 335/4 = 83.75 which can be rounded to 84 as a whole number
It's nearer 84 than 83, so 84 is the answer.