22 The number of all the males a month old or more who were counted was 7,500.

Read Numbers 3:22 Using Other Translations

Those that were numbered of them, according to the number of all the males, from a month old and upward, even those that were numbered of them were seven thousand and five hundred.
Their listing according to the number of all the males from a month old and upward was 7,500.
There were 7,500 males one month old or older among these Gershonite clans.