We don't who who the first person was but it was around 30,000 BC when tally marks were made on bones and things to represent numbers.
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Yes, the Etruscans invent the Roman Numbers.
Prime numbers are not invented.
India did not invent the number 0. The number 0 is invented by the people who invented the rest of numbers
No, although he did devise a way to predict them.
There is no known origin of the order of operations or PEMDAS. PEMDAS is considered as the proper way to tackle a given mathematical expression in terms of what operation should be performed first.