Name the number of shows when there was 2 million views
CREATE TABLE "table1_13336122_6" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_million" text
);
SELECT COUNT("u_s_viewers_million") FROM "table1_13336122_6" WHERE "no_in_season"=2;