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
Printing arbitrarily at 600DPI doesn't make much sense.
A Letter/A4/magazine page at 300DPI about 8.5Mpix, at 600DPI is would be 34Mpix. 600DPI is already overkill for photography, it is mostly useful for text.
The bigger the picture, the farther away the viewers are, so that the required resolution is lower. It actually evens out so you don't need ...
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.