An integer is any whole number that can be positive, negative, or zero. However, whole numbers are non-negative integers, which means they are zero or positive (0, 1, 2, 3, ...).
Among the options you provided:
- 0 is a whole number.
- -2 is an integer but not a whole number.
- 7 is a whole number.
- 783 is a whole number.
Therefore, the integer that is not a whole number is −2.