Grand Theft Auto V (GTA 5) is not officially available for Android devices. There have been some reports of unlicensed, unofficial versions of the game appearing on the internet, but these are likely to be scams or infected with malware, and it is not recommended to download or play them.
It is always best to wait for an official release of a game on a platform, rather than downloading unlicensed or pirated versions. Doing so not only risks damaging your device and exposing your personal information, but it also supports software piracy and undermines the hard work of the developers who created the game.
If you want to play Grand Theft Auto V, your best bet is to purchase it on a platform that it is officially available on, such as Xbox One, PlayStation 4, or PC.