Printing a photo at anything over 300 dpi is wasted effort, since the printers can't do it and our eyes can't see it. A print shop machine will automatically resample it smaller first.
A 6000x4000 pixel image is aspect ratio 3:2.
This 3:2 shape will print:
4x6 inches will print at 1000 dpi
8x12 inches will print at 500 dpi
12x18 inches will print at 353 dpi
The 2000D has a max resolution of 6000×4000 pixels, an aspect ratio of 3:2; therefore at 600dpi you can print it at (6000 / 600) × (4000 / 600) = 10 × 6⅔ inches. Saving the photo as JPEG doesn't make a difference to the resolution, but may affect the quality.