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Find the largest four digit number which has a total of exactly 3 factors. Assuming that 1 and the number itself are factors

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me

  1. you want the largest perfect square less than 10000. The three factors will be 1,√n, and n

    Any number not a perfect square will have 4 or more factors (or just 2 factors if it is prime)

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    Steve

  2. The largest prime less than 100 is 97 so the largest four digit number with 3 factors is 97^2=9409.

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    Daniel

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