Is the social security number an ID number?

You can't. The ID number consists of 18 digits and letters and is issued by the public security organ. Social security number is the only sign that citizens participate in social insurance. It is issued by human resources and social security departments to record personal social security information. The first six digits of the social security number format are administrative division codes, and the last six digits are personal numbers. The first 6 digits of the ID number are the date of birth, and the last 12 digits are the serial number.