How do I know if a stone fireplace was built structurally sound?

Hi, Jake.

I bought a house with a second story pre-fab fireplace surrounded by a stone hearth and faced with stone averaging 1 3/4" thick on the sides and front all the way to the ceiling which is vaulted. The fireplace is off center in the room so total height is about 8' on the left edge and 10' on the right.