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Not if the GFCI breaker is supplying the circuit you are wanting to put the GFCI receptacle into.
1. Check with local regulation , authorities. Go by the local law or regulation. 2. If the application is in wet area, risk of ground fault is more, hence go for GFCI.
A GFCI outlet has a TEST and RESET switch. Press reset and see if it fixes problem. If reset won't stay in that means that a ground fault condition is present and may be on another outlet that is fed from the tripped GFCI. If this isn't the problem check the main breaker feeding the GFCI and ensure it isn't tripped. If none of this works the GFCI itself may be bad. If you have a Volt Meter you can remove the outlet from the wall receptacle and make sure there is voltage present. You can also see if there is a branch circuit connected. To troubleshoot you can disconnect the branch circuit and then try reset. If you have voltage on input and GFCI won't reset with branch circuits removed, replace the GFCI.
You need a GFCI outlet at any location that is within 6' of a water source. You also need a GFCI outlet in a room with a concrete floor, any garage, and any location outside the home or under the home in the crawl space. A GFCI outlet protects you from electrical shock near water or moisture. You can protect more than one outlet with 1 GFCI outlet. Connect the incoming power to the LINE side of the GFCI outlet and all the other outlets getting power from that outlet to the LOAD side of the GFCI outlet. That way they will all be protected by 1 GFCI. A GFCI breaker is used to protect an entire circuit and not just individual receptacles. It is often cheaper to use GFCI receptacles than a breaker, especially if "piggy-backed" such as described above. It is also more convenient to reset a GFCI receptacle than to reset a breaker. But your question is "why." From this I suspect you may be misunderstanding the difference between a breaker and GFCI protection. To keep things simple let me say that a GFCI does not work on the same principles as a standard breaker. It provides a much safer protection than a standard breaker. Even with a ground you need GFCI protection as listed above.
Your question is a bit vague, but let's try a two part answer. If you have a GFCI breaker in an electric panel you should only have one connection at the breaker, but the breaker will protect all devices on the circuit. If you are talking about a GFCI outlet, they are equipped to extend the GFCI protection to other non-GFCI outlets by using the proper "output" connection on the GFCI.