All multiples of 520, which is an infinite number.
Just multiply 260 by numbers: 520 (2x), 780 (3x), etc.
No it is not.
No.
All multiples of 260 (which are infinite) including 260, 520, 780, 1040, 1300 . . .
Yes, 520 / 2 = 260
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Yes, the result is 130.
All numbers are divisible by 1.
Prime numbers are divisible because any numbers that are divisible are prime. If a number isn't divisible, it isn't prime. Prime numbers have to be divisible by at least one pair of numbers to be prime.
The prime factors of 520 are: 2 5 13
All whole numbers are divisible. If you mean divisible by numbers other than 1 and themselves, the answer is the set of composite numbers.
between 1 and 600 inclusive there are:300 numbers divisible by 2200 numbers divisible by 3100 numbers divisible by both 2 and 3400 numbers divisible by 2 or 3.