There are other documents that you can use as proof of your social security number. Some of the documents that the DMV will accept as proof of your social security number include a birth certificate, passport, or military ID. If you don't have any of those documents with you, the DMV may be able to look up your social security number using your name and date of birth. So, even if you don't have your social security card with you, you should still be able to get your license.