Answer
Multiples of 688 are:
688, 1376, 2064, 2752, 3440, 4128, 4816, 5504, 6192, 6880, 7568, 8256, 8944, 9632, 10320, 11008, 11696, 12384, 13072, 13760, 14448, 15136, 15824, 16512, 17200, 17888, 18576, 19264, 19952, 20640, 21328, 22016, 22704, 23392, 24080, 24768, 25456, 26144, 26832, 27520, 28208, 28896, 29584, 30272, 30960, 31648, 32336, 33024, 33712
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