An integer is a whole number that can be positive, negative, or zero, and does not include fractions or decimals.
From the given options:
- 2 (integer)
- 15 (integer)
- -34 (integer)
- 4 (integer)
- 23 (integer)
The integers among the options are 2, 15, -34, and 4. However, since one of the options includes "4 23" which could imply it is split or a decimal/fraction representation, it could be interpreted as one of these two values or as erroneous formatting.
Therefore, the integers are:
- 2
- 15
- -34
- 4
If you're looking for a single integer response, you can choose any of those listed, such as 2 or 15 or -34 or 4.