A very big number over 23 million digits long has discovered to be the “largest known prime number”.
This numberwas discovered using a software called GIMPS.
A prime number is a number that can only be divided by itself and by 1. For example: 2, 3, 5, 7, 11, and so on.
Prime number are used in Cryptography (the study of secret messaging, involves sharing information via secret codes), credit cards, cell phones, all depend on cryptography.