fix prime

Author: BiscayN

brain_games/games/prime.py

@@ -6,7 +6,7 @@
 def is_prime(number):
     if number == 2:
         return True
-    for i in range(3, int(number ** 0.5) + 1):
+    for i in range(2, int(number ** 0.5) + 2):
         if number % i == 0:
             return False
     return True