“A prime number is one (which is) measured by a unit alone.”

—  Euclid , book Elements

Elements, Book 7, Definition 11 (12 in certain editions)
Euclid’s Elements

Original

Πρῶτος ἀριθμός ἐστιν ὁ μονάδι μόνῃ μετρούμενος.

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Euclid 6
Greek mathematician, inventor of axiomatic geometry -323–-285 BC

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