If you had 25 buttons ( red coloured) and 77 buttons (blue coloured). Half of the blue ones melted due to a supernova in the Atlantic ocean. Multiply red and blue buttons :)
Prime only has two factors one and its self a composite number has more factor than one and its self exsample: 12 - 1,2,3,4,6,12 = 12 is a composite number 7 - 1,7 =prime number
