Great question! To clarify, an integer is a whole number that can be positive, negative, or zero. Whole numbers, on the other hand, are a subset of integers that are non-negative, meaning they include 0 and all the positive counting numbers like 1, 2, 3, and so on.
Since all whole numbers are integers, if we are looking for an integer that is not a whole number, we need to consider negative integers. A straightforward example would be -1. This is an integer, as it is a whole number, but it is not a whole number because it is negative. Other examples include -2, -3, and so forth.
So, in summary, an integer that is not a whole number could be any negative integer, such as -1.