input: 
  from typing import Dict
  
  def is_prime_number(input_dict: Dict[str, int]) -> str:
      """ Given a dictionary with a key 'number' mapped to an integer, determine if the integer is a prime number.
      >>> is_prime_number({'number': 17})
      '17 is a prime number.'
      >>> is_prime_number({'number': 16})
      '16 is not a prime number.'
      """
      num = input_dict['number']
      is_prime = True
      for i in range(2, num):
          if num % i == 0:
              is_prime = False
              break
      return f'{num} is a prime number.' if is_prime else f'{num} is not a prime number.'
  
output:     if num <= 1:
          return f'{num} is not a prime number.'