Because it's the only one with only two factors.
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Only itself and one because 97 is a prime number
In that range, the only prime number is 97.
Only by itself and one because 97 is a prime number
The prime number is 97 because it is only divisible by 1 and itself. 91 is divisible by 1, 7, 13, and 91.
97 is only divisible by itself and one because it is a prime number