No it is not.
No.
All multiples of 520, which is an infinite number.
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Yes, the result is 130.
2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260.
260
Yes, 520 divided by 2 = 260
Just multiply 260 by numbers: 520 (2x), 780 (3x), etc.
520 = 2 × 2 × 2 × 5 × 13
520 / \ 2 260 / \ 130 2 / \ 65 2 / \ 5 13
All multiples of 260 (which are infinite) including 260, 520, 780, 1040, 1300 . . .