👉 In mathematics, an irrational number is a real number that cannot be expressed as a simple fraction (i.e., it does not have a finite decimal representation). This means that there are infinitely many rational numbers that can represent it. For example, 2, π, and the square root of two are all irrational numbers because they do not fit into a finite set of fractions. Irreducible fractions with denominator less than or equal to 10 (or any integer value) are considered irrational numbers