Mostly, yes. '13 Hours' tells the story of the Benghazi attacks. The story is real, but the movie may have adjusted some minor details for cinematic purposes. But the main events and the heroic actions of the people are true to what happened.
Yes, it does. 13 Hours is based on real events. It depicts the events that took place during the 2012 Benghazi attacks. However, like any movie adaptation, there may be some dramatization for the sake of entertainment, but overall it is a fairly accurate portrayal of what happened.
To a large extent, 13 Hours tells the true story. However, some artistic liberties might have been taken for cinematic purposes, but the core events and their essence remain true.
I don't really know. To determine if it's a true story, you might need to research its origin, any claims made by the author, or see if there are references to real people or events. But without that, it's a mystery!