No, it's not. Most people don't know any math above arithmetic. And Plato is dead. Math has evolved over the ages.
Well, there you are. Most people weren't qualified to enter Plato's Academy, either. The arithmetic of those days was puny: they didn't have the zero. The zero was invented in India and adopted by the Arabs, and didn't reach Europe until 800 AD or so. But their math was pretty good even if not common.