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Q: Is 81 a sqare number

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The square root of 81 is 9 as in 9 x 9 = 81

Square roots can be positive or negative. 9 x 9 = 81 -9 x -9 = 81 9 is the positive square root of 81.

No

YES

It was 1936.

Yes.

It is 7

because it can divied by 2

Yes

The number is 7.

No, 81 is an odd number.

It is a number that multiplies itself to create a product

Because 30 times 30 = 900

Yes it is... 15 squared equals 225.

81 is not prime it's a composite number

The square number of 81 is 9. 9 x 9 = 81

28

Number 81 is Rashied Davis.

81 is not a prime number. 81 = 3 * 3 * 3 * 3

No, -81 is not an irrational number because it can be represented in the form x/y = -81

It is the area of the surface.

It is a composite number, you can get 81 by mulitpling 1*81, 3*27, and 9*9.compositeNo the number 81 is not prime it can be divided by nine.composite

144

81 is a square number

Number 81 on the periodic table is Thallium.