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IsPrime

// finding whether 'n' is prime or not


private boolean isPrime (int n)
{
   if (n<=1) return false;
   if (n==2) return true;
   if (n%2==0) return false;
   int m=(int)Math.round(Math.sqrt(n));

   for (int i=3; i<=m; i+=2)
      if (n%i==0)
         return false;

   return true;
}
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