Fait mathématique: 6210 is the number of 5×5 matrices with non-negative entries with every row and column adding to 2.
Culture générale: 6210 is an uninteresting number.
Date historique: December 31st is the day in 1998 that the European Exchange Rate Mechanism freezes the values of the legacy currencies in the Eurozone, and establishes the value of the euro currency.