Nope. To work out if a number is a multiple of three - add all the digits in the number together. If the answer will divide by 3, then so will the original number. In this case, 5+8+0 = 13 - which doesn't divide by 3.
580
The first 10 multiples are 58, 116, 174, 232, 290, 348, 406, 464, 522, and 580
116, 232, 348, 464, 580, 696, 812, 928, . . .
580
No - the nearest big number divisible by 3 is 600 - which is 20 more than 580 As 20 is not divisible by 3 then also 580 is not.
The multiples of 58 are the infinite set that starts 58, 116, 174, 232, 290, 348, 406, 464, 522, 580, and so on.
193.3333
There are an infinite amount of answers to that. 290, 580, 870, 1160 and 1450 are the first 5 of them.
145, 290, 435, 580, 725, 870, 1015, 1160, 1305, 1450, 1595, . . .
The first 15 multiples of 116: 116, 232, 348, 464, 580, 696, 812, 928, 1044, 1160, 1276, 1392, 1508, 1624, 1740 . . . ∞
The first 15 multiples of 145: 145, 290, 435, 580, 725, 870, 1015, 1160, 1305, 1450, 1595, 1740, 1885, 2030, 2175 . . .
The first 15 multiples of 116: 116, 232, 348, 464, 580, 696, 812, 928, 1044, 1160, 1276, 1392, 1508, 1624, 1740 . . . ∞