The best answer is that the Tathagata is a prince of India and becomes a Buddha after enlightenment, so I want to say whether the Tathagata is a Buddha or a human being.

The Tathagata is the Buddha, the Buddha is the awakened one, and he is the supreme one, just waiting for enlightenment, feeling but not lost!

Buddha Sakyamuni has been a Buddha in the endless Ganges sand for a long time. He came to our earth 2,500 years ago and appeared as a Buddha (he was born as a prince of India). This is the eighth time that the Buddha came to the world to show his Buddha's appearance!