why we use bool functions in c!

Question

using this we return functions.

Answer 1

Use it to return
in if statement so get any data return true instead of 0 or 1

Answer 2

I posted a simple easy code to determine if a number is prime.
I used a function that returns a bool value to determine if a number is prime. The result is true if the parameter passed as an integer it is a prime, or false if not..
Check my code here: https://code.sololearn.com/c8gjJwr0o455/?ref=app