There are 5! = 120 such numbers.
1 set
6*6*3 = 108 numbers.
6*5*4*3*2*1=720 possible numbers
Whole numbers are divisible by 4 if the number formed by the last two individual digits is evenly divisible by 4. For example, the number formed by the last two digits of the number 2628 is 28, which is evenly divisible by 4 so the number 2628 is evenly divisible by 4.
48 of them if digits may not be repeated. 100 if they can.
192 ways
numbers that are divisible by 4 is either: 4n or numbers in which the number formed by last two digits are divisible by 4
500
24
1 set
It is 120 if the digits cannot be repeated.
5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.
3x3x3=27
6*6*3 = 108 numbers.
36
4*3*2*1 = 24
6*5*4*3*2*1=720 possible numbers