diff --git a/1ano/1semestre/fp/aula04/isprime.py b/1ano/1semestre/fp/aula04/isprime.py
index 44b73e5..b3d0d0c 100755
--- a/1ano/1semestre/fp/aula04/isprime.py
+++ b/1ano/1semestre/fp/aula04/isprime.py
@@ -1,4 +1,6 @@
 def isPrime(n):
+    if n == 1:
+        return False
     for x in range(2, n):
         if n % x == 0:
             return False