Does Siddharta Gautama happen to be the last person to reach Buddhahood?
2 Answers
Yes, if you think in terms of a fully enlightened Buddhas. Maytrea Buddha will be the next. However, there are also private Buddhas. Most of Buddhas are private Buddhas. They are enlightened, but they don't teach the Dhamma.
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To add to @konrad01, private Buddhas don't occur when the dispensation of a Buddha is still there. Hence the last Buddha is Siddhartha Gautama.