Whole Numbers are simply the numbers 0, 1, 2, 3, 4, 5, ... (and so on)
No Fractions!
Whole numbers are all the nonnegative integers
\(0, 1, 43, 234678, 356545789765\) are all whole numbers
\(-5, \frac{1}{2}, \pi, 3.9, 6\frac{2}{3}\) are not whole numbers.
-5 is a negative integer
½ is not an integer
\(\pi\) is not an integer
3.9 is not an integer
\(6\frac{2}{3}\) is not an integer.
All this time, I have not answered the question at hand: Is 0 a whole number?
Yes, 0 is a whole number.