What is the name of the place with 582.20 square km area?
CREATE TABLE "westmorland_county_new_brunswick" (
  "official_name" text,
  "status" text,
  "area_km_2" text,
  "population" real,
  "census_ranking" text
);
SELECT "official_name" FROM "westmorland_county_new_brunswick" WHERE "area_km_2"='582.20';