Earlier quoted context omitted.
The last reactor to shutdown was Unit 3 in December 2000. The whole facility has been undergoing cleanup and decommissioning since. https://en.wikipedia.org/wiki/Chernobyl_Nuclear_Power_Plant#...
Drifting slightly off topic but it always seemed amazing to me that they kept the other reactors running even in the immediate aftermath of the Unit 4 explosion. Literally just down the hall, units 1, 2, and 3 ran for years afterwards. These were all manually controlled reactors that needed humans in the control room. No "working from home "on these.
They all had multiple serious incidents before and after the Chernobyl Disaster (1982 - partial core meltdown at #1, 1984 - incidents at #3 and #4, 1991 - fire at the turbine hall of #2). This was the most unsafe nuclear power plant in the whole USSR and the operators were in grave danger all the time.