Define an irrational number.

Explanation

An irrational number is a real number that cannot be expressed as a ratio of integers, for example, `sqrt 2` is an irrational number. Again, the decimal expansion of an irrational number is neither terminating nor recurring.
For example,
`sqrt2` is an irrational number, but when `sqrt2` is multiplied by `sqrt2`, we get the result 2, which is a rational number.
`sqrt2 xx sqrt2 = 2`
We know that `pi` is also an irrational number, but if pi is multiplied by `pi`, the result is `pi^2`, which is also an irrational number.
`pi xx pi = pi^2`
It should be noted that while multiplying the two irrational numbers, it may result in an irrational number or a rational number.