70,000 people died the day the bomb was dropped on Hiroshima, another 70,000 were injured. That is quite a bit fewer than the estimated one million who would have died on both sides if the war hadn't ended when it did.
It was more like 80-100,000 from the initial explosion and resulting fires and another 75-100,000 from the radiation effects felt over the victims and their offspring, sometimes even affecting the next generation also. That was only for Hiroshima. Nagasaki casualties were similar in number and distribution. The end result was a total of somewhere between 300-400,000 total deaths (only half of which were initial, the rest suffered slowly) with about the same amount injured. There was also complete destruction to about 70% of the buildings and infrastructure in both cities.
Do not ever downplay these 2 events or try to justify them in terms of casualties, especially when you use such ludicrously low numbers. The 'estimate' of 1 million dying in a continued conflict is just that...a guess and we will never know how true it may have been. Given the condition of the Japanese military and their equipment odds are they would have surrendered quickly and losses could have been as low as 100,000 and 70-90% would have been military, not the half a million civilians that were targeted by the 2 bombs.