About "Prime Number"

"Prime Number..." Did you heard of that? A lot of people will know this.
"Prime Number" is a  positive integer greater than 1 which is divisible only by 1 and themselves.
So, 1 is NOT a prime number because it is not greater than 1, 2 IS a prime number because it is greater than 1 AND it is divisible only by 1 and 2, itself.
Now you will know what is prime number. Then, let's find few prime numbers.
1: X 2: O 3: it can only be divided by 1 and 3, so it is a prime number.
4: it can be divided by 1, 2, 4, so it is NOT a prime number.
5: it can only be divided by 1 and 5 itself, so it is a prime number.
So, you already found first 3 prime numbers! Congratulations!
If I list prime number, it goes like this: 2, 3, 5, 7, 11, 13, 17, 19... and so on.
Now, you will know perfectly about prime number. Have a good day~