To find the square root of a perfect 4 digit square number we find the first figure by looking at the first figures and we find two possible last figures by looking at the last figure. Yes 9 is in the list of digital roots that are always perfect squares. For example if you re trying to find the square root of 7 first you d need to find the first perfect square below 7 which is 4 and the first perfect. 
				
			
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