If a number is divisible by 2, the number is even.
A number is divisible by 2 if it ends in 0, 2, 4, 6, or 8.
If a number is not divisible by 2, the number is odd.
A number is not divisible by 2 if it ends in 1, 3, 5, 7, or 9.
59 ends in 9, so it is not divisible by 2.
This means that 59 is odd.