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Q: Why is the number 40 not a perfect square?

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No.

36

36 is the only perfect square amongst those listed.

No, 40 is not a perfect square

If by 'perfect number' you mean 'perfect SQUARE', then yes. 49 is an odd number and a perfect square.

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It is a square number but not a perfect square number.

No.

1600 (square of 40)

40 is a not perfect square.

the closest whole number's whose square is close to 40 are 6 and 7 with the squares being 36 and 49 respectively. A perfect square doesn't have any decimal parts to it, thus 40 is not a perfect square since root 40 =6.32455....

36

The square root of 1600 is 40. (40x40=1600)

36 is the only perfect square amongst those listed.

Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".

2020^2 = 400400 is a perfect square.......perfect square  noun Mathematics .1.a rational number that is equal to the square of another rational number.2.a polynomial that is the square of another polynomial.Origin:1935-40

For a number to be a perfect square, the number's square root has to be a whole number. 9 is a perfect square because its square root is a whole number, 3. If the square root of the number is a decimal, then it is not a perfect square. For example, 13 does not divide evenly so it not a perfect square.

No, 40 is not a perfect square