# 150 followers problem!

There is a number $$\overline{ABCD}$$ such that $$\overline{ABCD}^{2}$$=$$\overline{PQRSABCD}$$.Then can you tell the only possible value of the four digit number $$\overline{ABCD}$$.

Extra credit :prove that this is the only possible answer for a 4 digit number

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