1,991 Delegates is the number of delegates that you need to be nominated for President in the first ballot of the Democratic Party Convention.

Current count:

Biden: 1,180.
Sanders: 885.
Warren: 72.
Gabbard: 2.

On April 25 New York will award 274 delegates.
On April 28 Pennsylvania will award 186 delegates.

The reaming states will also award smaller numbers.

For more information,

see: https://www.realclearpolitics.com/epolls/2020/president/democratic_delegate_count.html