Need to split one large high-res video into sub-parts

Question

I have a very large high-res video (5760 x 3240) that I would like to split into 9 separate videos, each 1920 x 1080.  These would make up the content of a 3x3 video wall and would be 'stitched' back together by the media players driving the wall.
I am new to After Effects, so sorry if this sounds like a dumb question, but I was told this was possible using AE.

Answer 1

Thanks for all the responses.
My next question was how I can make sure I am positioning the video in the composition to the exact pixel.  Seems a little inexact just dragging, but I will try the advanced sizing controls.
I am being told that the individual media players can sync up to the ms.  We are going to test everything this week once we receive the final video. Since the entire video will be 60gb, there is the question of storage, so we are adding 64gb flash to each player.
We are doing a similar wall in Europe and they are using a single video server along with a matrixer to get the job done.  
I've done 2x2 walls pixel perfect and most hardware will choke on that, so I am hoping the multiple media players will be better in handling smaller chunks.
I will let you know how it works out.