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If you include 100 and 225, there are 6:
10 squared = 100
11 squared = 121
12 squared = 144
13 squared = 169
14 squared = 196
15 squared = 225
Perfect squares cannot have digits after the decimal point.
There is no pair of perfect squares that sums to 21. And the question is pointless if it is not about perfect squares because in that case there are infinitely many answers.There is no pair of perfect squares that sums to 21. And the question is pointless if it is not about perfect squares because in that case there are infinitely many answers.There is no pair of perfect squares that sums to 21. And the question is pointless if it is not about perfect squares because in that case there are infinitely many answers.There is no pair of perfect squares that sums to 21. And the question is pointless if it is not about perfect squares because in that case there are infinitely many answers.
No. Convention defines perfect squares as squares of positive integers.
The squares of integers are known as perfect squares.
There are no four-digit perfect squares that are palindromes.