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prime integer test
This function determines whether a small integer is prime.
The range of permitted values for N is the same the range
of permitted values for the NextPrime function: on most
platforms
N <= 45000 should work fine, on some platforms
considerably larger values will work.
For N greater than the limit an error is raised.
/**/ IsPrime(32003);
true
/**/ IsPrime(10^100);
false
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