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It is: 9 and 9 times 18 = 162

Q: What is the smallest number which is a multiple of 162 and also a perfect square?

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It is the smallest composite number that is both a perfect square and a perfect cube.

Perfect squares are positive. A smallest negative number doesn't exist. The four smallest prime numbers are 2, 3, 5 and 7. The smallest perfect square would have to be 2^2 x 3^2 x 5^2 x 7^2 or 44,100

There is not a number that is a perfect square and perfect cube between 1 and 25.There is not a number that is a perfect square and perfect cube between 1 and 25.There is not a number that is a perfect square and perfect cube between 1 and 25.There is not a number that is a perfect square and perfect cube between 1 and 25.

(3x5x7x11)2 =1334025

"Still" implies that the original number is a square number. In that case, the answer is as follows: There is no number such that it is a perfect sqiuare and that the number increased (or decreased) by 10 is also a perfect square. And if you do not limit it to perfect square then every non-negative number is a square with the number that is 10 more also being a square.

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8 is a multiple and is not a perfect square.

2.

The smallest perfect square is 121.

The smallest square number qreater than 1 is 2. * * * * * 2 is not a perfect square number.

No. The smallest 2 digit number is 10 the smallest 3 digit number is 100 - so the question is whether (100-10) is a perfect square? No - 90 is not a perfect square. 8x8 is 64 and 9x9 is 91, not 90.

49

The smallest integer is 11 but there is no smallest number! 0.11 is a smaller number and will give a perfect square. 0.0011 is smaller still, and 0.000011 even smaller. That sequence is endless!

It is the smallest composite number that is both a perfect square and a perfect cube.

69

25

1 (1x1x1 or 1x1)

1764