For years, a French mathematician searched for a proof that a gigantic number is prime. His method is still used 150 years ...

Companies, like people, are usually known by their names, but people and companies both have other types of identification, often issued by government agencies in the form of identification numbers.

Janet Berry-Johnson, CPA, is a freelance writer with a background in accounting and income tax planning and preparation for individuals and small businesses. Her work has appeared in Business Insider ...

An Individual Taxpayer Identification Number is a nine-digit number the IRS uses to process taxes and administer tax laws. The agency issues them only to certain nonresident and resident aliens, as ...