diff --git a/maths/prime_check.py b/maths/prime_check.py
index e60281228..ed8fbbae8 100644
--- a/maths/prime_check.py
+++ b/maths/prime_check.py
@@ -4,7 +4,7 @@ import math
 import unittest
 
 
-def prime_check(number):
+def prime_check(number: int) -> bool:
     """
     Check to See if a Number is Prime.
 
@@ -42,7 +42,7 @@ class Test(unittest.TestCase):
     def test_not_primes(self):
         self.assertFalse(prime_check(-19), "Negative numbers are not prime.")
         self.assertFalse(
-            prime_check(0), "Zero doesn't have any divider, primes must have two"
+            prime_check(0), "Zero doesn't have any divider, primes must have two."
         )
         self.assertFalse(
             prime_check(1), "One just have 1 divider, primes must have two."