find the greatest number of four digit which is a perfect square
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9801. Since the number is 4 digits, its square root will have always have 2 digits. Thus, 9801 is the number which is the larfest 4 digit number and is a perfect square.
nikhilji:
but how plzz tell ( explanation)
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The square root of a four-digit number is always a two digit number. Thus, the greatest four-digit perfect square number will be the square of the biggest two digit number.
The biggest two-digit number is 99.
Therefore, the greatest four-digit number will be 99^2 = 9801.
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