2 square numbers subtracted from each other to make 8 = -6
As a product of its prime factors: 5*73 = 365
9 and 36
25 and 81
3 and 5
They can be: 16 -4 = 12
25 and 144
9 and 1
They are: 4*4 = 16
They are: 9+81 = 90
They are: 49+16 = 65
4 (the square of 2) and 36 (the square of 6) add up to 40.