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R is a programming language and software environment for statistical computing and graphics. The R language is widely used among statisticians and data miners for developing statistical software and data analysis.[From Wiki] There are Two way to install R on Ubuntu. Method 1: Using Terminal * Open Terminal and Type  sudo apt-get install r-base * After download to Start R  Programming  Type R on Terminal and Learn by Coding. Method 2 Installing R Studio * Go this site  and download it.

If you know the characteristic of prime number then you can easily find out it. A number be a prime number if it follows these characteristic: Number must be positive integer Number has exactly two positive integer factors or divisors, Number, only divisors by 1 and itself . So on above characteristic we can say that 5 is prime Number, because it has no divisor unless 5 and 1. Now suppose another Number 7. It is also a prime number. But both 7 and 5 are odd number. If you write a computer program or manually try to find out prime numbers you will see that all prime numbers are odd except 2, because only Even Number 2 has exactly two positive integer factors or divisors. These are 2 (itself) and 1.

Sometimes people may confuse about 0 (zero), is 0 integers? If 0 is integer, after that, is it positive integers (+)? Or Negative integers (-)? Positive Integers Positive integers are whole number greater than 0 (zero), example: 1, 2,3,4,5,6,7,8 … to infinity. Negative Integers Negative integer are whole number smaller than 0 (zero), example: -1, - 2,-3,-4,-5,-6,-7,-8 … to infinity. 0 is not considered to be a positive integer or a negative integer. But 0 is an integer. Here is Black Block represented Positive Integers and Red Block represented Negative Integers.