Which of these numbers is not an integer:
The number 22.5 is not an integer.
Integers include the positive and negative whole numbers including zero. An integer cannot be a decimal or fractional part with it.
The set of integers is denoted by the numbers
In the given numbers, observe that the only number with decimal part is 22.5. Rest all the numbers are whole numbers with positive or negative sign.
So, the whole numbers with positive or negative sign are integers.
Since 22.5 is the only number that is not a whole number as it contains the fractional part, so this is not an integer.
Thus, the number that is not integer is 22.5.
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