7 factorial means 7x6x5x4x3x2x1
which can be rewritten as 7x(3x2)x5x(2x2)x3x2x1 when 6 and 4 are factored.
Notice the repeating factors are (3x3)x(2x2)x(2x2) = (3x2x2)x(3x2x2) = 12 squared = 144
144
81
25
Just 1.
The answer is 49.
36
The greatest perfect square is 36.
64
81
25
9
idl
One.
36
650 has no factor that is a perfect square, other than 1.
16
16
Just 1.