Didn't you ask this same question about 2 months ago?
For an 8x10" print at 250dpi you would need a resolution of exactly 5 million pixels (2000x2500). That's just theoretical though, an image with a smaller number of pixels will probably look fine, so long as you're not examining it with your eyeball an inch from the paper.
You need to bear in mind that the aspect ratio of a consumer digicam may not fit common print sizes. For example, a 4:3 image will need to be cropped (or shrunk with extra borders on the top and bottom) to print at 8x10".