Check decimal value in Alert

Summary:

How can we check that at worksheet increment % is decimal or not

Content (required):

We have increment % or Amount. In Increment% we want to get this value in alert and apply that either this value with decimal or not.

I am looking the function which return either decimal value or not?

Version (include the version you are using, if applicable):

22B

Code Snippet (add any code snippets that support your topic, if applicable):