Was Sparta the most populated in the 400 B.C?

No, Sparta was not the most populated city-state in Greece around 400 B.C. While it was a powerful military state, its population was relatively small compared to other city-states like Athens. The Spartan society was characterized by a strict social structure and a focus on military training, which limited its population growth, particularly in the free citizen class. In contrast, Athens had a larger population due to its more diverse economy and greater emphasis on trade and culture.