The largest Prime number currently known is 243,112,609 − 1 with 12,978,189 digits. Some computer somewhere is working on the next one.
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The only number that has 2 factors is the number 2.
prime number if it only has less than 2 factors
Any prime number has exactly two factors, 1 and the number itself.
No a prime number has only 2 factors which are itself and one but a composite number has more than 2 factors
If a number has more than two factors, it's composite.