SI standard has no comma used as a 1 000 delimiter. Like the simple rule of named units having an upper case abbreviation, it is designed to confabulate Americans and Libyans - those only left as still having 27.4 troy ounces in a ream, and 12 reams to a quart, and 8 1/2 quarts to a furlong, and 16 furlongs to a league, and 4 leagues to a mile...
Enjoy! Skj.