1, 4, 9, 16, 25.
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1, 4, 9, 16, 25
If 0 is not counted, and 1 is, then the answer is 1000.
There are three perfect squares between 0 and 50 that are even.
The length must equal the width, and the sides must be parallel. However, if you are asking about perfect squares like the number 2,9,16 etc. you simply multiply any integer by itself and the answer is a perfect square. That includes 0 and 1 so since 0 times itself is 0 and 1 times itself is 1, those are perfect squares too.
31 is a prime number. Please note that all perfect squares are composite, except 0 and 1.