Photography printing?

I have a question, What's the number to put when you export a photo on Lightroom to print? For example on image sizing I have resolution 240 is that good for printing? I want to make large prints. I use Nikon. Any recommendation for printing!

It depends on your camera and how many mega-pixals it is. For example a 3.1 mp camera will take a photo as clear as a 35 mm. So what the difference? When it comes to megapixals… It goes like this… A 4… 5… 7… 8… 10… 12… 14… Camera takes the same quality photo… The only difference is the size. You can only see the true size of a photo if it is opened with windows paint. If you have a large mega-pixal camera then feel free to have it printed or developed in a large size with awesome quality.