This question is not very specific and, therefore, the answer is going to be a bit creative (hope you don't mind!).
Make a normal square with 9 coins (3 x 3) and then stack the left over coins however you like on the 9 coins! :-)
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105
The two whole numbers closest to 162 in square root form are 12 and 13.
10 sqrt(13) is.
13
2 radical 13