Is Grand Theft Auto V on Steam?

No. Grand Theft Auto V is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.

When did Grand Theft Auto V release?

Grand Theft Auto V released on September 17, 2013.

Grand Theft Auto V

Sep 17, 2013ShooterRacingAdventurePlayStation 3 PlayStation 4PC (Microsoft Windows)Xbox 360 Xbox One

Grand Theft Auto V — frequently asked questions

Is Grand Theft Auto V on Steam?: No. Grand Theft Auto V is not distributed on Steam, so there is no Steam Charts or SteamDB player count for it. Its live popularity is tracked here via Twitch viewership instead.
What platforms is Grand Theft Auto V on?: Grand Theft Auto V is available on PlayStation 3, PlayStation 4, PC (Microsoft Windows), Xbox 360, Xbox One, Xbox Series X|S, PlayStation 5, Linux, Mac.
When did Grand Theft Auto V release?: Grand Theft Auto V released on September 17, 2013.

About Grand Theft Auto V

Grand Theft Auto V is a vast open world game set in Los Santos, a sprawling sun-soaked metropolis struggling to stay afloat in an era of economic uncertainty and cheap reality TV. The game blends storytelling and gameplay in new ways as players repeatedly jump in and out of the lives of the game’s three lead characters, playing all sides of the game’s interwoven story.

Summary via IGDB.

Grand Theft Auto V on Wikipedia

Grand Theft Auto V is a 2013 action-adventure game developed by Rockstar North and published by Rockstar Games. It is the seventh main entry in the Grand Theft Auto series, following 2008's Grand Theft Auto IV, and the fifteenth instalment overall. Set within the fictional state of San Andreas, based on Southern California, the single-player story follows three protagonists—retired bank robber Michael De Santa, street gangster Franklin Clinton, and drug dealer and gunrunner Trevor Philips —and their attempts to commit heists while under pressure from a corrupt government agency and powerful criminals. Players freely roam San Andreas's open world countryside and fictional city of Los Santos, based on Los Angeles.

Source: Wikipedia (text under CC BY-SA 4.0).