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  2. 2,147,483,647 - Wikipedia

    en.wikipedia.org/wiki/2,147,483,647

    Euler used trial division, improving on Pietro Cataldi's method, so that at most 372 divisions were needed. [3] It thus improved upon the previous record-holding prime, 6,700,417, also discovered by Euler, forty years earlier. The number 2,147,483,647 remained the largest known prime until 1867. [4]