PROGRAMMING:Square judgment

Judge whether a number is square.
###Input format:
Enter an integer t.
###Output format:
If the number is square, output yes, otherwise output No.
###Input example:
Here is a set of inputs. For example:
```in
nine
sixteen
twenty
```
###Output example:
The corresponding output is given here. For example:
```out
Yes
Yes
No
```







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