# Prime Numbers. Prime integers

## Definition. Examples. Mobile App

**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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