How can I change decimal to integer?

[TIMAI2]

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Check if number is an integer

This is my first post here; correct me if I am doing anything wrong. My question is: how can I check if number is an integer? Do I have to create a custom function or is there a built - in function for that? If there is no built - in function, that's what I've made so far (edit: just realised I can't use floor like that): [blocks] (I am new with functions in MIT App Inventor, so didn't know how to set 'boolean' to a value. Correct me if I am doing anything wrong.)

A decimal integer ?