121 is, itself, a perfect square.
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121
Yes. 121 = 11 x 11.
No, it is not. For it to be a perfect square, the square root of it would have to be an integer, but √120 ≈ 10.954. 100 and 121 are perfect squares nearest to 120. ■
None. There is no perfect square that, when doubled, equals 60.
The smallest perfect square is 121.