support post

HiI was wondering if anyone can tell me if a 4x4 support post or beam is a structual component. I was watching this home inspection show and saw this same 4x4 that was underneath a bedroom on a corner which is upstairs and the inspector said to the clients it is of no structual concern. so is this holding up that corner or not . Again a 4x4 on the corner of a exterior with a bedroom above thanks guy/galsSorry no picture cant get it to resize in kodak , any ideas why i cant please share with me