why we use bool functions in c!

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

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