23
$3000 for the next prime, $50,000 for the next Mersenne prime, $150,000 for a 100 million digit prime.
9797 is the largest two digit prime number.
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
The first 'three digit' Prime Number is 101.
The largest single digit composite number is 9. The largest prime number is 17 million digits long. The definition of a composite number is any number that has at least one positive divisor other than one or the number itself (it is not a prime number). The largest composite digit is therefore longer than the largest prime number by at leaf +1.
11 is the smallest two-digit prime number.
997 is the biggest 3 digit prime number.
The first two-digit prime number is 11.
The largest single digit prime number is 7.
The smallest three digit prime number is 101.
The largest 2-digit prime number is 97.