input: from typing import List
  
  
  def is_prime(numbers: List[int]) -> List[bool]:
      """Determine if each number in the list is a prime number.
      >>> is_prime([17, 28])
      [True, False]
      >>> is_prime([2, 3, 4])
      [True, True, False]
      """
      results = []
      for num in numbers:
          if num < 2:
              results.append(False)
              continue
          is_prime = True
          for i in range(2, num):
              if num % i == 0:
                  is_prime = False
                  break
          results.append(is_prime)
      return results
output:     results = []
      for num in numbers:
          if num < 2:
              results.append(False)
              continue
          is_prime = True
          for i in range(2, int(num**0.5) + 1):
              if num % i == 0:
                  is_prime = False
                  break
          results.append(is_prime)
      return results