Hi,
You can print as large a print as you want with that resolution. It depends on the printer you intend to print too, the viewing distance, and the tools for resizing the image.
Obviously, you will never be able to add more detail, but the image can be made quite large and usable.
For example, I used to take cropped 6 megapixel images and resize them and print to 24x36 canvases that looked great on the wall. You wouldn't go up and look at it from 1 foot and expect to see a lot of detail.
There are lots of tools for resizing your image for print. I use Qimage ultimate and It's "Hybrid SE" algorithm and print sharpening to prepare my large prints for local and lab printing.
Wishing you great success in printing your images.