To date, the only Millennium Prize problem to have been solved is the Poincaré conjecture, which was solved in 2003 by the Russian mathematician Grigori Perelman.

Are any of the Millennium Problems close to being solved?

Of these monster math problems, only one has been officially solved--the Poincaré Conjecture, by Grigori Perelman. ... [Perelman] is the first and only one to have solved one of the Millennium Problems and, according to many, this situation may not change for a long time.

How many of the Millennium Problems are solved?

At the turn of the 21st century, the Clay Mathematics Institute announced a list of seven of the most important unsolved math problems. The problems all have a $1 million prize awarded to whoever solves them. One of the seven problems has been solved, while the other six remain open questions.