Perfect square checker

Check if a number is a perfect square (can be expressed as n² for some integer n).

Number

Perfect squares

A perfect square is the product of an integer with itself. 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225...

Quick test

Compute √n. If the result is an integer, n is a perfect square. 144 → √144 = 12 → perfect square.

Last digit pattern

Perfect squares can only end in 0, 1, 4, 5, 6, or 9. A number ending in 2, 3, 7, or 8 is never a perfect square.

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