The units digit of the square root of 66564 will be either 8 or 2. Can you please explain how can this be derived?

Dear Student, Let 66564= x 66564= x2Now for getting unit digit 4 we can have possibilities as last digit= 2 then 22= 4 or when last digit = 8 then 82= 64 = 4only last digitRegards

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