I know you know that I misspelled the word, something I rarely do
Forget the square circles idea, it is silly to pose such a question in reference to God. As God can do anything He so desires, how could He be limited by a human idea?
Few atheists or scholarly theists deny that an omnipotent being cannot create square circles. The issue is a logical absurdity/contradiction, not a limitation on God. Can God cease to exist? Can God do things contrary to His moral nature? Can God do logically impossible things like make an orange the color orange and black at the same time? Make married bachelors?
You will believe incoherent things if you wrongly assume that God can to whatever He desires. God cannot cease to be Deity and incarnate as the puppet Yoda to run the universe. God cannot die nor lie. God cannot make Satan God and turn Himself into Satan. He cannot make Jesus Christ of Nazareth, George Bush and Marilyn Monroe at the same time. If you think he can because He is God or that He might desire to so it must be possible, I cannot reason with you. In your world, 2+2=4 and 5. God is either triune or not. He cannot make Himself solitary or 100-fold. There is either one God or many gods. Jesus is either God or created being. He cannot be both in His pre-existence, etc. etc.