None of them are prime numbers because they each have more than two factors.
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97 is a prime number. 98 and 99 are not.
99 is not a prime number.
Let's try 99 and 98! 99 is 3 x 3 x 11 and 98 is 2 x 7 x 7 98 and 99 are consecutive numbers, composite numbers, less than 100 and there is no prime numbers between them!
It is: 2+97 = 99
100