The first five positive numbers evenly divisible by four are four, eight, 12, 16 and 20. Every fourth number from that point on is divisible by four.
A quick way to tell if a large number is divisible by four is to look at the last two digits of the number. If they together represent a number divisible by four, the whole number is a multiple of four. For example, 5,789,416 is divisible by four because the last two digits, 16, represent a number into which four divides evenly. Likewise, 908 is divisible by four because 08 is a multiple of four. All multiples of four are even numbers, though not all even numbers are multiples of four.