# Prime number in PL/SQL

Prerequisite – PL/SQL introduction

A prime number is a whole number greater than 1, which is only divisible by 1 and itself. First few prime numbers are : 2 3 5 7 11 13 17 19 23 …..

In PL/SQL code groups of commands are arranged within a block. A block group related declarations or statements.
In declare part, we declare variables and between begin and end part, we perform the operations.

Examples:

```Input :  5
Output : true

Input : 10
Output : false
```

Below is the required implementation:

 `declare` `   `  `-- declare variable n, i  ` `-- and temp of datatype number ` `n number;              ` `i number;             ` `temp` `number;         ` `   `  `begin` `   `  `-- Here we Assigning 10 into n ` `n := 13;                  ` `   `  `-- Assigning 2 to i ` `i := 2;  ` `  `  `-- Assigning 1 to temp ` `temp` `:= 1;  ` `  `  `-- loop from i = 2 to n/2 ` `  ``for` `i ``in` `2..n/2 ` `    ``loop ` `        ``if mod(n, i) = 0 ` `        ``then` `            ``temp` `:= 0; ` `            ``exit; ` `        ``end` `if; ` `    ``end` `loop; ` `   `  `    ``if ``temp` `= 1 ` `    ``then` `        ``dbms_output.put_line(``'true'``); ` `    ``else` `        ``dbms_output.put_line(``'false'``); ` `    ``end` `if; ` `end``;           ` ` `  `-- Program End `

Output:

`true`
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