Prime numbers
Whole that have only 2 factors
Prime numbers are positive integers greater than 1 that are divisible only by 1 and themselves. In other words, they are numbers that have no other factors other than 1 and themselves. Some examples of prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, and 43.
Prime numbers play an important role in number theory and cryptography. They are used in various applications such as generating RSA public and private keys for secure communication, or in detecting duplicate entries in hash tables.
There are several methods to determine whether a given number is a prime or not. The most common methods involve trial division, where the number is divided by all smaller prime numbers to check for divisibility, and the Primality testing algorithms like Miller-Rabin and AKS. These algorithms can efficiently determine whether a number is prime or not even for very large numbers.
One interesting fact about prime numbers is that there are infinitely many of them. This was famously proved by the ancient greek mathematician Euclid more than 2000 years ago. The proof involves assuming that there are only finitely many primes, and then deriving a contradiction from this assumption.
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