Q: Is the number 18 a square number?

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A square number because 18*18 = 324

The square root of 18 is an irrational number because it cannot be expressed as a fraction.

It is neither because the square root of -18 is an imaginary number but the square root of 18 is irrational

The square root of (any number that isn't a perfect square) is irrational.

It is 2 times 18 = 36 which is a perfect square number because 6 time 6 = 36

False

no

no, it not because it does not have a product of itself

Yes

It is an irrational number which is 3 times square root 2

18 and 17.

182= 324 square root 18= 4.242640687... 1 and 9 are square numbers that are factors of 18.

324 square feet. This is an easy calculation - just multiply the length by the width. The answer is the number of square feet.

The factors of 18 are 1, 2, 3, 6, 9, and 18. The only square number of those numbers is 9.

5607 + 18 = 5625, a perfect square. The perfect square of a square root is the number you started with.

it is impossible to have a square root for a negative number. so your answer would be "not possible".

It is a square number but not a perfect square. The nearest perfect squares, on either side, are 4^2 = 16 and 5^2 = 25. Since there is no integer between 4 and 5 and the square is a strictly monotonic function, 18 cannot be a perfect square.

18 is a factor of 36. 36 is a square. 18 is not.

18 square feet is an area, and half of 18 = 9 is a number. You can't compare numbers with areas (or any measurement with units).

52 =25

The square root of 648 is 18 times the square root of 2. 648 has no perfect square root.

306

An 18 * 18 square has an area of 324 square units.

Yes, in so far as all numbers are squares (of some number). But it is not a perfect square.

sqrt(18) = 3*sqrt(2) is an irrational number.

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