How can you tell if a number is an integer or not?

An integer is a whole number, either positive or negative. What helps define an integer is if it can be divided into a whole number by another whole number (except 0).
For example, if we had these answer choices:
12, 103, 5, and 0.5.
Which would be the number that's NOT an integer?
The answer is 0.5, as it is not a whole number.
I hope this helps!

When the number doesn't have a symbol that tells you if the number is positive of negative. Also numbers that are not whole numbers aren't integers. Hope this helps! Pls mark me as the BRAINLIEST!!! :)

Then why is the question on here if you know the answer