What do all even numbers have in common?

All even numbers except 2 are composite since they are divisible by 2. All Mersenne numbers [math]M_n = 2^n - 1[/math] with an even exponent are composite except [math]M_2[/math]. read more

All even numbers are evenly divisible by two - hence the terminology even. All even numbers, when written in base ten, end with the digit [math]0, 2, 4, 6[/math] or [math]8[/math]. All even numbers, when written in base two (also known as binary), end with the digit [math]0[/math]. read more

They have only one thing in common. By adding 1 to either an even number or an odd number makes them opposite. (even becomes odd and odd becomes even). read more

All even numbers (numbers evenly divisible by 2) will end with 2, 4, 6, 8, or 0. read more