Answer
Multiples of 648 are:
648, 1296, 1944, 2592, 3240, 3888, 4536, 5184, 5832, 6480, 7128, 7776, 8424, 9072, 9720, 10368, 11016, 11664, 12312, 12960, 13608, 14256, 14904, 15552, 16200, 16848, 17496, 18144, 18792, 19440, 20088, 20736, 21384, 22032, 22680, 23328, 23976, 24624, 25272, 25920, 26568, 27216, 27864, 28512, 29160, 29808, 30456, 31104, 31752
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