A number is called irrational , if it cannot be written in the form $p/q$ , where $p$ and $q$ are integers and $q$≠ 0 .
$e.g$ √2 , √3 , √15 , π $etc$

Example: Locate √2 on the number line
Example : Locate √3 on the number line.
Example : Locate √5 on the number line .
How to find irrational numbers.
Find an irrational number between 1/7 and 2/7