Prime Numbers

In Mathematics, a prime number is a natural number greater than 1 that has only 2 different divisors: the same number and 1. On the other hand composite numbers that are those who have another natural divisor apart from the same number and 1. The prime numbers less than 100 are the following: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89,and 97. This conclusion was reached through the “Eratostenes Sieve.”

The property of being a prime number is called primality (primalidad).

Sometimes the number 1 is considered to be a prime number, however some authors don´t consider it as a prime number because it only has one divisor: 1.

We can consider that the prime numbers are the bricks with which we can build any natural number. For example we can write the number 23,244 as the product of 2²· 3· 13· 149.

In the decimal system all the prime numbers except 2 and 5 finish in 1, 3, 7, or 9. 

Homework: I want you to tell me in the next lesson the main ideas in this text. Don't translate, please