Ok this is going to probably be really painful for old hands, but this is something I've always really had a hard time wrapping whats left of my grey matter around.

My camera produces an image that is 5616 x 3744 pixels.

When I'm printing out and A4 sized print, should I use the above size or should I use the size that I use for posting on AP which is 1024 x 683 pixels?

What about for A3 or A2 sized prints?