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Generally a 300ppi image resolution will print very nicely.
Things to concern yourself with are that from the pixel number itself (6 MP in this example) it is impossible to know the resolution with out knowing the image size. Additionally, a common misconception is the believed equivalence of dots-per-inch and pixels-per-inch which is not even close to being equivalent in reality.
So what to do: If you have some form of image manipulation software, it should have the capability of doing image resizing. Open an image and find the resizing tool. It should give you the ability to set image size and resolution. Set it to 4x6 and 300ppi and save it as a JPEG at a quality or "9" or above. Of course, all the different software packages have different ways of doing this so it is impossible to give an absolute methodology.
Hope this helps.
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gary
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