[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

maths/special_numbers/kaprekar_number.py

@@ -30,7 +30,7 @@ def is_kaprekar_number(number: int) -> bool:
     if number <= 0 or math.log10(number).is_integer():
         return False  # Disallow powers of 10 (e.g., 10, 100, 1000)
 
-    square = str(number ** 2)
+    square = str(number**2)
     for i in range(1, len(square)):
         left, right = square[:i], square[i:]
         if number == int(left or "0") + int(right):