CREATE TABLE table_name_38 (population INTEGER, region VARCHAR(255), regional_county_municipality VARCHAR(255), name VARCHAR(255))
Cowansville has less than 16 regions and is a Brome-Missisquoi Municipality, what is their population?
    
SQL: SELECT MIN(population) FROM table_name_38 WHERE regional_county_municipality = "brome-missisquoi" AND name = "cowansville" AND region < 16