👉 Nonirrational is a mathematical concept that refers to numbers that cannot be expressed as ratios of integers. These numbers are irrational because they do not satisfy the property of rationality, which states that every rational number can be expressed as a ratio of two integers. For example, 2, 3/7, and π (pi) are all nonrational numbers, but √2 is a rational number because it can be expressed as a ratio of two integers.