No it is not.
No.
All multiples of 520, which is an infinite number.
Yes, 520 / 2 = 260
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2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260.
130
3/4 of 520 is 390.
A number is divisible by 4 if the last two digits are divisible by 4.A number is divisible by 4 if the last two digits are divisible by 4.A number is divisible by 4 if the last two digits are divisible by 4.A number is divisible by 4 if the last two digits are divisible by 4.
1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520
Just multiply 260 by numbers: 520 (2x), 780 (3x), etc.
4 is not divisible by 684. 684 is divisible by 4.