Enter any whole number into the Perfect Square Calculator and find out whether it's a perfect square. You'll see the square root, the nearest perfect squares below and above your number, and a clear verdict — all calculated from a single number input. Also try the Digital Root Calculator.
Is It a Perfect Square?
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Square Root
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Integer Square Root (Floor)
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Nearest Perfect Square Below
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Nearest Perfect Square Above
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Perfect Square (n × n)
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A perfect square is a number that can be expressed as the product of two identical integers. For example, 49 is a perfect square because 7 × 7 = 49. The square root of a perfect square is always a whole number (integer). See also our GCF Calculator (Greatest Common Factor).
Take the square root of the number and check whether the result is a whole number. If √n is an integer, then n is a perfect square. For example, √36 = 6 (integer), so 36 is a perfect square. √50 ≈ 7.071 (not an integer), so 50 is not a perfect square.
If the square root is 6, then the perfect square is 6 × 6 = 36. Any integer n multiplied by itself gives the perfect square n².
Yes, 0 is considered a perfect square because 0 × 0 = 0. Its square root is 0, which is a whole number (integer), satisfying the definition of a perfect square. You might also find our Product — Vedic Multiplication useful.
Perfect squares are always rational numbers. Since their square roots are integers, they can be expressed as a ratio of two integers, making them rational. Non-perfect squares like 2 or 3 have irrational square roots (like √2 ≈ 1.4142...).
There are 10 perfect squares between 1 and 100: 1, 4, 9, 16, 25, 36, 49, 64, 81, and 100. In general, there are exactly n perfect squares from 1 to n².
No, negative numbers cannot be perfect squares in the realm of real numbers. Since any real number multiplied by itself yields a non-negative result, perfect squares are always zero or positive. In complex numbers, the concept extends differently, but conventionally perfect squares are non-negative.
A perfect square number is an integer that is the square of another integer (e.g., 25 = 5²). A perfect square trinomial is a polynomial expression in the form ax² + bx + c that can be factored into the square of a binomial, such as (x + 3)² = x² + 6x + 9. They are related concepts but apply to numbers and polynomials respectively.