Rule 2 states that for a number to be divisible by 2, the last digit must be even (0, 2, 4, 6, or 8). Rule 3 checks if the sum of the digits is divisible by 3. Rule 4 has two tests for divisibility by 4: the last two digits are divisible by 4, or the tens digit is even and ones digit is 0, 4, or 8 or the tens digit is odd and ones digit is 2 or 6. Rule 5 states that for a number to be divisible by 5, the last digit must be 5 or 0.