Yes
No: 351 divided by 4 is 87.75
Yes, 172 divided by 4 is 43.
No, because the sum of all the digits is not divisible by 9.
Only 5 and 1 because it's a prime number
Itself and any other multiples of 3 is divisible by three
105 is divisible by 1, 3, 5, 7, 15, 21, 35, 105.
There are 6 of them which are 8 16 24 32 40 and 48
There are 30 days in September. 30 is divisible by: 1, 2, 3, 5, 6, 10, 15, and 30.
It is 72.It is 72.It is 72.It is 72.It is 72.It is 72.
They are 72/1, 72/2, 72/3, 72/4, 72/6, 72/8, 72/9, 72/12, 72/18, 72/24, 72/36 and 72/72. You could also include 72 divided by the negative values of the denominators.
The following pairs of numbers have 72 as their LCM 1 & 72 2 & 72 3 & 72 4 & 72 6 & 72 8 & 9 8 & 18 8 & 36 8 & 72 9 & 24 9 & 72 12 & 72 18 & 72 24 & 72 36 & 72 72 & 72