Are the volcanoes in Yellowstone National Park and Yellowstone National Park active?

It is an active volcano, but now it is in a dormant period. It has erupted three times during the geological period. The last time was 600 thousand years ago. Volcanic ash covered the surface of Fiona Fang with a thickness of1500m. This is a huge crater! When humans discovered it, they found it in photos taken by satellites, that is to say, we didn't know the true face of Lushan Mountain at first!