diff --git a/python/tasks/task_08_is_prime.py b/python/tasks/task_08_is_prime.py
index 2ccb53e..f086eb8 100644
--- a/python/tasks/task_08_is_prime.py
+++ b/python/tasks/task_08_is_prime.py
@@ -4,4 +4,13 @@ def is_prime(n: int) -> bool:
     """
     Vrátí True, pokud je číslo prvočíslo.
     """
-
+    if n <= 1:
+        return False
+    if n == 2:
+        return True
+    if n % 2 == 0:
+        return False
+    for i in range(3, int(n ** 0.5) + 1, 2):
+        if n % i == 0:
+            return False
+    return True