Find the largest number of 2 digits which is a perfect square with very simple method and by the process of prime factorization
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For a 2 digit number to be a square, the square root will be a 1 digit number.
The greatest 1 digit number is 9. Its square is 9 × 9 = 81
In prime factors - 81 = 9 × 9 = 3 × 3 × 3 × 3
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