diff --git a/maths/special_numbers/proth_number.py b/maths/special_numbers/proth_number.py
index 146e6fc90..181cc1afb 100644
--- a/maths/special_numbers/proth_number.py
+++ b/maths/special_numbers/proth_number.py
@@ -76,6 +76,10 @@ def isprothnumber(number: int) -> bool:
         ...
     TypeError: Input value of [number=6.0] must be an integer
     """
+    if not isinstance(number, int):
+        msg = f"Input value of [number={number}] must be an integer"
+        raise TypeError(msg)
+
     if number < 1:
         msg = f"Input value of [number={number}] must be > 0"
         raise ValueError(msg)