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Prime numbers are numbers that fall into a table of 1 and into their own table.
If called in short, prime numbers are numbers that have only two factors - one is 1 and the other is itself.
[I explained below what the factor means.]
Some examples of Prime numbers are: 2, 3, 7, 11, 17 etc. These are numbers that divide completely by 1 and also divide themselves completely.
The smallest prime number is 2. All prime numbers are positive.