code: def prime2(a):
      if a == 2:
          return True
      if a < 2 or a % 2 == 0:
          return False
      return not any(a % x == 0 for x in range(3, int(a**0.5) + 1, 2))
  
label_desc: Use image node_id 2 for calling a global function with example usage: prime2(a) and returns: unknown, True, False