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.
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Yes I believe, if my calculator is correct, 97 is one.
It is a Prime Number.41 is prime.
Whenever you wanted to know a number is prime or composite, use this site. It must be usefull and its calculator can tell you if is a number prime or not.: prime-calculator dot com. It has lots of other abilities. Enjoy it.
There is no simple answer because there is no known pattern to prime numbers. You could try dividing the each number by all the prime numbers less than or equal to its square root. If none of the go into the number then it is a prime.
It doesn't have any factors beside 1 and 29 so it is a prime number