They continued to resist AFTER Hiroshima... thats why there was Nagasaki. That should answer the question.
Doesn't answer the morality question. War is hell, fine but..
Yes. After Hiroshima, the Japanese military convinced themselves that we didn't have enough nuclear material for a second bomb, and they also convinced Hirohito. Thus Nagasaki.
I don't know if we had enough for a third or not, but the Japanese didn't want to take that chance, and that's what matters.