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A round shape is the statically most rigid setup for containing pressure. It makes sure the flame front reaches all parts of the cylinder symmetrically and in the shortest time possible. A round shape maximizes the volume with the shortest path into all directions radially. Sure, you could build square cylinders&#; but they would perform poorly in comparison, it&#;s not worth trying.
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You also have the problem of trying to create a seal at the apex of each of the four corners. You would have to round the edges&#; and then you may as well go circular anyway&#;
On the topic of squares, I have always wondered if a car would sound different with exhaust piping made from square pipe instead of round
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deevlash said: thr honda NR500 gp bikes from the 80's? or early 90's had oval pistons, more like oblongs really. They made a road bike with oval pistons too the NR750 which cost a fortune new and is now probably worth even more. Not sure why the idea was never pursued further, as far as I can remember the GP bike was meant to be a complete dog and only won one wet race. The NSR which replaced it was far more succesful and it used conventional pistons but different firing orders, ie the "big bang" bikes, i think there were traction problems but surely they wouldn't be as much of a problem with a car? maybe somebody else could elaborate?