Anything divided by 1 is always itself.
2 squared 1 = 4 so the divisibility rule is that it is divisible by 1, 2 and 4.
By tautology. If it did not work, it would not be a divisibility rule!
What is the divisblity rule by 8
There is no easy rule for divisibility by 34.
The special divisibility rule of 17 is "Take the difference of the rest of the digits and the last digit times 5." For instance: 17 1 - 7 * 5 = 1 - 35 = -34 which is divisible by 17.
The divisibility rule for 2 works because the base of our number system, 10, is divisible by 2.
Able to Be Divided
2.50
13 is a prime number - it can only be divided by 1 and itself (for an integer answer).
1, 2, 3 and 4
1, 2, 4 and 47
Judging by some of the questions asked on this site, the first rule is that divisibility is a concept that applies only to whole numbers.