As of October 2015, the largest known prime number is 2^57,885,161 − 1, a number with 17,425,170 digits.
The largest staircase comosite largest staircase composite is the number 2223 because 1 is not counted as a prime so the 1 digit prime is 2, the smalles 2 digit prime is 11 and smallest 3 digit prime 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.
97A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 97 is the largest 2 digit prime number.
There is no three digit prime number whose square root is a prime number. Prime numbers have no factors other than 1 and themselves. Any number having a prime number as a square root is a composite number.
2 is the largest prime number closest to 1.
The Mersenne prime M(43112609) which is 2^43112609 - 1 has 12,978,189 digits. It is the third largest prime known as of 2016.
It is: 97*2 = 194
It is 9.
The number 2.