An integer is any whole number that can be positive, negative, or zero. Whole numbers are non-negative integers, which include 0 and all positive integers.
Out of the options given:
- 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.