What is my 'true' file size?

Hi, I am puzzled.
I have a Canon 350D digital camera and have been shooting in the highest quality format at 8MP. When I import the files into iPhoto, they show at 3456 x 2304 pixels and 1.5MB - is this correct?
Multiplying 3456x2304 = 7,962,624 pixels (8MP) - why does it show at 1.5MB? - should the file size not be much larger?
I am trying to work out how large I can enlarge some of my photos too - any help would be much appreciated
thanks!
Mark

Mark
Because MegaPIXELS are not the same as MegaBYTES.
Regards
TD

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