“prosperity / glory” in Japanese is 栄, read ei, saka (えい, さか). It is a Grade 4 Kyōiku kanji, taught in year 4 of Japanese elementary school, and appears in words such as 栄養 (nutrition).
What does 栄 mean?
町が大きく栄える。
Same sound, different character — the classic trap. Compare them side by side: