CREATE TABLE table_5398 ("Name of community" TEXT, "Area  ( km\\u00b2 ) " FLOAT, "Population" FLOAT, "Excised from" TEXT, "Date granted" TEXT, "Deed number" TEXT)

What is the smallest population with an Area (km ) of 1115.4?
SELECT MIN("Population") FROM table_5398 WHERE "Area (km\u00b2)" = '1115.4'
SELECT MIN("Population") FROM "table_5398" WHERE "Area (km\u00b2)" = '1115.4'