IsPrime results

/c++/examples/l2> IsPrime 1049758323523
Thinking about candidate odd divisors of 2147483647
 ....
/c++/examples/l2>   IsPrime 10497583
Thinking about candidate odd divisors of 10497583
10497583 is a prime number
/c++/examples/l2>    IsPrime 10497581
Thinking about candidate odd divisors of 10497581
10497581 is a prime number
/c++/examples/l2>    IsPrime 10497585
Thinking about candidate odd divisors of 10497585
10497585 is NOT prime, witness: 3
/c++/examples/l2>    IsPrime 10497587
Thinking about candidate odd divisors of 10497587
10497587 is NOT prime, witness: 113

Stumbling on a prime pair: Probability ~= 1/100