1) the first digit plus the number formed by the second and third digits,

2) the first digit multiplied by the number formed by the second and third digits, and

3) the sum of the three digits

are all perfect squares.

The answer is 916.

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The answer is 916.

1) 9+16 = 25, which is 5^2.

2) 9 x 16 = 144, which is 12^2.

3) 9 + 1 + 6 = 16, which is 4^2.