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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