No, humpback whales are not endangered as a species. The IUCN Red List classifies the humpback whale as Least Concern, with a worldwide population of roughly 135,000 whales and an increasing trend, as most populations have recovered from historic whaling.
Some regional groups are still at risk: the isolated Arabian Sea population numbers only around 80 individuals and is considered endangered. Recovery elsewhere led the United States, Canada, and Australia to downlist the species’ threatened status.
Source: Humpback whale, Wikipedia
Image: Humpback whale breaching off Cabo San Lucas by Juan Cruzado Cortés, CC BY 4.0, via Wikimedia Commons.