diff --git a/palindrome.py b/palindrome.py
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+++ b/palindrome.py
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+"""
+palindrome_number.py
+Simple beginner program to check whether an integer is a palindrome.
+
+Usage:
+  python3 palindrome_number.py         # interactive input
+  python3 palindrome_number.py 121     # runs for the given number (optional argument)
+"""
+
+import sys
+
+def is_palindrome_number(n: int) -> bool:
+    """
+    Return True if integer n is a palindrome (reads same forwards and backwards).
+
+    Works for non-negative integers. Example: 121 -> True, 123 -> False.
+    """
+    if n < 0:
+        return False  # negative numbers have a leading '-' so we treat them as not palindrome
+    original = n
+    reversed_num = 0
+    while n > 0:
+        digit = n % 10
+        reversed_num = reversed_num * 10 + digit
+        n //= 10
+    return original == reversed_num
+
+def main():
+    # Allow optional command-line argument: python3 palindrome_number.py 121
+    if len(sys.argv) > 1:
+        try:
+            value = int(sys.argv[1])
+        except ValueError:
+            print("Please provide a valid integer.")
+            return
+    else:
+        # Interactive input
+        try:
+            value = int(input("Enter an integer to check palindrome: ").strip())
+        except ValueError:
+            print("Invalid input. Please enter an integer.")
+            return
+
+    if is_palindrome_number(value):
+        print(f"{value} is a palindrome number ✅")
+    else:
+        print(f"{value} is NOT a palindrome number ❌")
+
+if __name__ == "__main__":
+    main()
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