I am getting this error ,  why is it????

the code is provided below the error :

[[[
Peace
Traceback (most recent call last):
  File "D:/Personal/python/botNasir0/botNasirMain0.py", line 17, in <module>
    obj = Login_System(root)
  File "D:/Personal/python/botNasir0/botNasirMain0.py", line 11, in __init__
    self.root.geometry('600 × 400 + 40 + 40')
  File "D:\Program Files\Python37\lib\tkinter\__init__.py", line 1841, in wm_geometry
    return self.tk.call('wm', 'geometry', self._w, newGeometry)
_tkinter.TclError: bad geometry specifier "600 × 400 + 40 + 40"
]]]

THE CODE:

from tkinter import*

class Login_System:
    def __init__(self,root):
        print ("Peace")
        self.root = root
        self.root.title("bOTnASIR")
        self.root.geometry('600 × 400 + 40 + 40')


root = Tk()


obj = Login_System(root)
root.mainloop()