kann527 wrote:
I am new to this so I am not sure what the file size is since I'm not resizing it.
The question asked about image size (height and width), not file size. Your operating system can tell you, or Lightroom can tell you in the Metadata Panel, set the dropdown to EXIF.
I am printing a 5x7. I know I have tried to print with long edge set at 1024 and set to 300 ppi and had the same result with the grainy ness.
If the exported file has a long edge of 1024, then you did resize the image, or you started with an image that was 1024. In any event, 1024 pixels is probably not large enough to fill 7 inches, that's really 1024/7=146 pixels per inch (rounded-off), and could be the cause of the "graininess" that you see, although I would use the word "pixelization" to describe what you see. So I'm not sure we are talking about the same thing, but let's go with it for now.
The solution depends on your answer to the original question.