diff --git a/Python/prime_number.py b/Python/prime_number.py
index 562bd93..0e21380 100644
--- a/Python/prime_number.py
+++ b/Python/prime_number.py
@@ -1,6 +1,6 @@
 num = int(input("enter a number: "))
  
-for i in range(2, num):
+for i in range(2, num**(0.5)+1):
 	if num % i  == 0:
 		print("not prime number")
 		break