A social security number is a nine digit number that is issued to residents in the United States. It is a number that is used by the United States government to keep track of its residents.
The number is attached to a variety of the activities of the residents including their job or where they go to school, how much they earn and more.
It is a number that is supposed to be confidential to the owner.
It is too sensitive to be revealed to just anyone.
In case of any fraud relating to the number, one can call the customer service line.