Is 5,673 divisible by 3 or 9 why or why not

Question

I don’t understand I just need a answer and then I need u to explain why or why not

Answer 1

5+6+7+3 =21 21/3 = 7 when the sum of digits divides evenly by 3, then the number itself is divisible by 3

5673/3 = 1891 with no remainder

1891 sums to 19 which isn't divisible by 3 so 5673 is Not divisible by 9 as 21 is not divisible by 9

to be divisible by 9 the number has to be divisible by 3 and then 3 again

5673/9 = 630 1/3