code: def is_square(a_positive_int):
      """Check if it is a perfect square."""
      x = a_positive_int // 2
      seen = {x}
      while x * x != a_positive_int:
          x = (x + (a_positive_int // x)) // 2
          if x in seen:
              return False
          seen.add(x)
      return True
  
label_desc: Use image node_id 1 for calling a global function with example usage: is_square(a_positive_int) and returns: True, False