input: from typing import Callable
  
  
  def is_prime(number: int) -> bool:
      """ Check if the provided number is a prime number.
      >>> is_prime(17)
      True
      >>> is_prime(20)
      False
      """
      if number <= 1:
          return False
      for i in range(2, number):
          if number % i == 0:
              return False
      return True
output:     if number <= 1:
          return False
      for i in range(2, int(number**0.5) + 1):
          if number % i == 0:
              return False
      return True