No.
No
No.
no
NO.
True. Since 615 ends in 5, it is divisible by 5. Since the sum 12, of the digits of 615, is divisible evenly by 3, 615 is divisible by 3.
The positive integer factors of 615 are: 1, 3, 5, 15, 41, 123, 205, 615
2 & 3
It is divisible by 3.
Yes
Yes
2 and 3.