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Hubs operate at layer one of the OSI network model - that is to say, any traffic coming in one port is retransmitted to every other port on the hub.
Routers, on the other hand, operate at layer three. The purpose of a router is to (somewhat obviously) route between networks. The practical applications are normally Cable/DSL routers that translate (using NAT) between an external IP address given to you by your telco to a variety of private internal address that your computers are set up using. As a matter of convenience, Cable/DSL routers have built-in DHCP servers, though a traditional router does not. Also, most routers have built in switches (very similar to a hub) on the private network, also as a matter of convenience, to allow multiple computers to connect to it.
Suffice to say, it's highly unlikely if you could use a hub for a router's purpose and have any degree of success. Looks like you're stuck going shopping for a router.
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