Prime Numbers. Prime integers

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Definition. A prime number is a natural number greater than 1 that is divisible only by 1 and itself.

Examples 2, 3, 5, 7, 11, 13, 17, 19, 23 are prime numbers.

2 - is the only prime even number. All other prime numbers are odd numbers.

For example, 3 is prime because it is divisible only by 1 and 3.

The numbers are not prime are called numbers composite.

Examples 6, 8, 9, 4, 10 are composite numbers.

6 is composite number because we can write the number 6 as follows: 6 = 2 · 3

So 6 is not divisible only by 1 and 6 but with 2 and 3

Similarly, 4 is the number of (and so is not prime) because

1 | 4

4 | 4

2 | 4 => 4 is not prime integer

The biggest prime number discoverd

The largest prime number discovered so far is 2 74,207,281 - 1 and was discovered in January 2016 by a computer from a university in Missouri. The first number is 5 million more than the previous digit prime number .

Keywords: even numbers, prime integers, composite numbers, divisibility, prime number, odd number

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