No it is not.
No.
All multiples of 520, which is an infinite number.
Yes, 520 / 2 = 260
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Yes, the result is 130.
Just multiply 260 by numbers: 520 (2x), 780 (3x), etc.
All multiples of 260 (which are infinite) including 260, 520, 780, 1040, 1300 . . .
39, 78, 117, 195, 312 and 936 are divisible by three.
520
520
520