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# Tag Archives: Largest known prime number

## What is a Prime Number?

An integer, say $p$, [ $\ne {0}$ & $\ne { \pm{1}}$ ] is said to be a prime integer iff its only factors (divisors) are $\pm{1}$ & $\pm{p}$.

## As?

Few easy examples are:
$\pm{2}, \pm{3}, \pm{5}, \pm{7}, \pm{11}, \pm{13}$ …….etc…this list increases upto infinity & mathematicians are trying to find the larger one than the largest, because primes numbers/integers are not symmetrical (as any one cannot guess the next prime after one.) As of now the biggest prime number found is (probably) $M-47$, called as Mersenne 47. This has an enormous value of $2^{43112609} -1$. It is very hard to write it on paper because it consists of $12978189$ digits.
»M47 was Invented in 2008. (more…)