Generating a random number using a quantum computer
Yes, it is possible to use quantum computer as a true random number generator, by applying Hadamard gates to all available qubits in initial $|0\rangle$ state and measuring them in the standard basis; but this is inefficient way of generating random numbers because quantum computer requires time to cool down its qubits to the initial state before starting a new computation.

There are other cheaper and faster methods of generating random numbers using quantum effects, see for example ANU Quantum Random Numbers Server