![]() If the number is divisible by any of the numbers then it is not a prime number. So the first idea is to divide the given number by all the numbers from 2 to n-1. ![]() Worst ApproachĪccording to the definition, a prime number is only divisible by 1 and the number itself. We will start with a bruit force approach and will keep making the program more and more efficient. Let's create Java programs that check whether a given number is prime or not. Let's create a simple program to check whether a number is prime or not. the biggest prime number as of Sept 2022 is 2 82,589,933 − 1. ![]() ![]() Prime numbers are used in cryptography, in order to generate public and private keys for encryption and decryption.įinding bigger prime numbers is a very difficult task.
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