Is Coreum proof of stake?

Could you please clarify whether Coreum operates on a proof-of-stake consensus mechanism? It's important to understand the underlying technology that powers a blockchain, as it affects factors like decentralization, security, and energy efficiency. If Coreum does indeed utilize proof-of-stake, could you elaborate on how it implements this model and the potential benefits it brings to the network? Additionally, how does this approach compare to other consensus mechanisms, such as proof-of-work?