Is number 4 reactor still burning in Chernobyl?

No, the Chernobyl Number 4 reactor is not burning. The reactor was destroyed in the catastrophic explosion in April 1986, and it has since been encased in a concrete sarcophagus and later a more permanent structure called the New Safe Confinement, completed in 2016. While the site remains radioactive and poses environmental hazards, there is no ongoing fire or nuclear reaction occurring in the reactor.