Haskell “No instance for” error

Question

I am trying to write a function that checks if a number is prime. I wrote this :

primeCheck :: Int -> Int -> Bool
primeCheck n i 
    | n == 2 = True
         


        

Answer 1

The problem is in converting from the Int for use in sqrt. Change the last line to

isPrime n = primeCheck n (floor (sqrt (fromIntegral n)))