How many product # have episode 1?
CREATE TABLE "table1_2289806_1" (
  "episode_num" real,
  "prod_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "originalairdate" text
);
SELECT MAX("prod_num") FROM "table1_2289806_1" WHERE "episode_num"=1;