The greatest 4 digit EVEN number is 9998. The smallest 4 digit number is 1000.

FOUR – DIGIT NUMBERS are the numbers that have four digits, i.e. they have ones, tens, hundreds and thousands places. In fact, to find the number of numbers between any two given numbers, we use the same formula. Therefore, there are 9000 four digit numbers in all. Hence, the answer of this question is (c) 9000.

3

The number whose unit digit is other than 0,2,4,6,8 are odd numbers. The smallest even natural number is 2 and smallest odd natural number is 1.

1 is neither a prime nor a composite number. The only even number which is a prime is 2. It is the smallest prime number. Except 2, all other prime numbers are odd numbers.

Prime numbers are numbers that have only 2 factors: 1 and themselves. For example, the first 5 prime numbers are 2, 3, 5, 7, and 11. By contrast, numbers with more than 2 factors are call composite numbers. Created by Sal Khan.

The largest known prime number (as of December 2020) is 282,589,933 − 1, a number which has 24,862,048 digits when written in base 10. It was found via a computer volunteered by Patrick Laroche of the Great Internet Mersenne Prime Search (GIMPS) in 2018.

The biggest number referred to regularly is a googolplex (10googol), which works out as 1010^100.

On December 26, 2017, the Great Internet Mersenne Prime Search (GIMPS), a collaborative computer project, discovered the largest known prime number. The number, 277,232,917-1, has 23,249,425 digits, nearly one million digits larger than the previous record prime number.