Bus number

While visiting a small town in  Portugal, I lost my purse in a bus.

When I reported the matter, I was asked the number of the bus. 

Though I did not remember the exact number, I did remember that the bus
number had a certain peculiarity about it. 

The bus number was a perfect square and when the plate was turned upside down,the number would still be a  perfect square.

I came to know from the bus company that they had only five hundred
buses numbered from 1 to 500.

From this I was able to deduce the bus number.

Now tell me the bus number.

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