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One.

Just 1.

Just 1.

The only square factor is 1.

1290 doesn't have any factors that are perfect squares other than 1.

1,290 is not a perfect square. The approximate square root is ± 35.916569992136

It is: 25

The greatest perfect square is 36.

The perfect square of 75 is 5625. Not sure of the relevance of "greatest", though.

5040 is not a perfect square. The greatest perfect square less than 5040 is 4900.

One is a perfect square that is a factor of 7.

It is: 1

99801 is the greatest 5 digit number * * * * * 99801 is not a perfect square! Sqrt(99801) = 315.91 (approx). The largest 5 digit perfect square is 99856 = 3162

8747

4

4

It is 4.

650 has no factor that is a perfect square, other than 1.

The largest 5 digit perfect square is 99856 = 3162

9

64

idl

81

4

49