What is the largest two-digit prime number?

The largest two-digit prime number is 97. A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself.

Looking at the number 97, it cannot be evenly divided by any number other than 1 and 97, confirming it is prime. In fact, 97 is not only a prime number, but it is also the largest two-digit number that fits this criterion.

On the other hand, the other numbers listed do not qualify as the largest prime: 89 is a prime number but is less than 97; 91 is not prime as it can be divided by 7 (91 = 7 × 13); and 99 is also not prime since it can be divided by 3 (99 = 3 × 33). Therefore, 97 stands out as the largest two-digit prime.