Right, the last time I asked this question someone just answered: "I don't know." So will someone give me a legitimate answer? I need to find the surface area of this rectangular prism.

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2