Next you can print it onto a 4×6″ photo paper. For US passport photos, you can print it using either matte, semi-matte or glossy photo paper. In the printing option, choose to fit the 4R sheet onto 4×6″ paper, not borders, no frame. This is very important. Otherwise the photo size will be wrong.
Then cut the photo along the gray lines. You will get 6 US passport photos of correct size (exactly 2×2″).