Although the condition we have with even and odd numbers is whether or not a result has decimals to say if it is even or odd… with prime and composite numbers the condition is to see how many divisors a number has to define it as prime or composite. Always looking that a number can be divided by many numbers but many results of those will not be integer numbers. So the results of the divisions always have to be integers.

## What is a prime number

A prime number is an integer number with exactly **two divisors** which **are 1 and the number itself**.

We have to comment that as such the number 1 is not prime since it only has one divisor. Also… 2 is the only number which is both even and prime.

The number 6 is not prime since it has four divisors: 1, 2, 3 and 6.

Once we understand what a prime number is, we are going to show some of them.

### Prime numbers from 1 to 100

Here we show you all the prime numbers from 1 to 100, although 1 and 100 are not prime, then they would be the prime numbers from 2 to 97. So here they are!

2, 3, 5, 7,

11, 13, 17, 19,

23, 29,

31, 37,

41, 43, 47,

53, 59,

61, 67,

71, 73, 79,

83, 89 y 97.

## What is a composite number

A composite number is an integer number with **more than two divisors** whose result must be an **integer number**. Understanding that all integers, except 0 and 1, are prime numbers or composite numbers. They are almost all numbers from 1 to 100.

### Composite numbers from 1 to 100

Below we show you all the composite numbers from 1 to 100, although since 1, 2 and 3 are not composite, then they would be from 4, which is a composite number, to 100, which is also a composite number. So here they are!

4, 6, 8, 9,

10, 12, 14, 15, 16, 18,

20, 21, 22, 24, 25, 26, 27, 28,

30, 32, 33, 34, 35, 36, 38, 39,

40, 42, 44, 45, 46, 48, 49,

50, 51, 52, 54, 55, 56, 57, 58,

60, 62, 63, 64, 65, 66, 68, 69,

70, 72, 74, 75, 76, 77, 78,

80, 81, 82, 84, 85, 86, 87, 88,

90, 91, 92, 93, 94, 95, 96, 98, 99,

100.

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