10^1000
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Buy a good calculator.
actually I'm not sure that you can do it on a calculator or not. I think the only way is deviding untill the half of the number. But I recently have found a great site that works as calculator and it can help you to understand a number is prime or not. Go to prime-calculator dot com.
Yes I believe, if my calculator is correct, 97 is one.
The maximum number is 5.
On most calculator there's a 'ENG' key