Date: Thu, 12 Sep 96 18:25:49 -0700 Hi my name is Trish. In grade 8. How do you find out if a number is a composite or prime if it is big like 37 529??? Reply soon got a test on Friday the 13th, Trish

Trish, in general it is not easy to find out. What you must do is try to divide it by each of the small primes up to its square root. If none divide it, it is prime. So start dividing by 2, then by 3, by 5, by 7 , by 11, ...

There is a note on this in Quandaries and Queries

Good luck on Friday the 13th!

Denis

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