Answer
Multiples of 645 are:
645, 1290, 1935, 2580, 3225, 3870, 4515, 5160, 5805, 6450, 7095, 7740, 8385, 9030, 9675, 10320, 10965, 11610, 12255, 12900, 13545, 14190, 14835, 15480, 16125, 16770, 17415, 18060, 18705, 19350, 19995, 20640, 21285, 21930, 22575, 23220, 23865, 24510, 25155, 25800, 26445, 27090, 27735, 28380, 29025, 29670, 30315, 30960, 31605
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