All numbers that are not rational are considered irrational. An irrational number can be written as a decimal, but not as a fraction.
A number ‘s’ is called irrational, if it cannot be written in the form p/q, where p and q are integers and q ≠ 0.
Some examples are: √2 , √3, √15, π, 0.10110111011110…
An irrational number has endless non-repeating digits to the right of the decimal point.
Here are some irrational numbers:
√3 = 1.732050…
π = 3.141592…
These irrational numbers do not exists on the number line. There infinitely many irrational numbers between two whole numbers such as 2 and 3 or 3 and 4 etc.
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