Is Polkadex a Parachain?

Excuse me, could you clarify whether Polkadex is indeed classified as a parachain? I'm trying to get a better understanding of its role within the broader blockchain ecosystem, specifically within the Polkadot network. As I'm aware, parachains play a crucial part in enhancing scalability and interoperability, so I'm eager to learn if Polkadex fits into this category or if it operates in a different manner. Thank you in advance for your insight.