The multiples of 21 are:
21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, 294, 315, 336, 357, 378, 399, 420, 441, 462, 483, 504, 525, 546, 567, 588, 609, 630, 651, 672, 693, 714, 735, 756, 777, 798, 819, 840, 861, 882, 903, 924, 945, 966, 987, 1008, 1029, 1050, 1071, 1092, 1113, 1134, 1155, 1176, 1197, 1218, 1239, 1260, 1281, 1302, 1323, 1344, 1365, 1386, 1407, 1428, 1449, 1470, 1491, 1512, 1533, 1554, 1575, 1596, 1617, 1638, 1659, 1680, 1701, 1722, 1743, 1764, 1785, 1806, 1827, 1848, 1869, 1890, 1911, 1932, 1953, 1974, 1995, 2016, 2037, 2058, 2079, 2100, ...
The multiples of 49 are:
49, 98, 147, 196, 245, 294, 343, 392, 441, 490, 539, 588, 637, 686, 735, 784, 833, 882, 931, 980, 1029, 1078, 1127, 1176, 1225, 1274, 1323, 1372, 1421, 1470, 1519, 1568, 1617, 1666, 1715, 1764, 1813, 1862, 1911, 1960, 2009, 2058, 2107, 2156, 2205, 2254, 2303, 2352, 2401, 2450, 2499, 2548, 2597, 2646, 2695, 2744, 2793, 2842, 2891, 2940, 2989, 3038, 3087, 3136, 3185, 3234, 3283, 3332, 3381, 3430, 3479, 3528, 3577, 3626, 3675, 3724, 3773, 3822, 3871, 3920, 3969, 4018, 4067, 4116, 4165, 4214, 4263, 4312, 4361, 4410, 4459, 4508, 4557, 4606, 4655, 4704, 4753, 4802, 4851, 4900, ...
The multiples of 56 are:
56, 112, 168, 224, 280, 336, 392, 448, 504, 560, 616, 672, 728, 784, 840, 896, 952, 1008, 1064, 1120, 1176, 1232, 1288, 1344, 1400, 1456, 1512, 1568, 1624, 1680, 1736, 1792, 1848, 1904, 1960, 2016, 2072, 2128, 2184, 2240, 2296, 2352, 2408, 2464, 2520, 2576, 2632, 2688, 2744, 2800, 2856, 2912, 2968, 3024, 3080, 3136, 3192, 3248, 3304, 3360, 3416, 3472, 3528, 3584, 3640, 3696, 3752, 3808, 3864, 3920, 3976, 4032, 4088, 4144, 4200, 4256, 4312, 4368, 4424, 4480, 4536, 4592, 4648, 4704, 4760, 4816, 4872, 4928, 4984, 5040, 5096, 5152, 5208, 5264, 5320, 5376, 5432, 5488, 5544, 5600, ...
Their common multiples are the multiples of their lowest common multiple:
21 = 3 x 7
49 = 7²
56 = 2³ x 7
lcm(21, 49, 56) = 2³ x 3 x 7² = 1176
which are:
1176, 2352, 3528, 4704, 5880, 7056, 8232, 9408, 10584, 11760, 12936, 14112, 15288, 16464, 17640, 18816, 19992, 21168, 22344, 23520, 24696, 25872, 27048, 28224, 29400, 30576, 31752, 32928, 34104, 35280, 36456, 37632, 38808, 39984, 41160, 42336, 43512, 44688, 45864, 47040, 48216, 49392, 50568, 51744, 52920, 54096, 55272, 56448, 57624, 58800, 59976, 61152, 62328, 63504, 64680, 65856, 67032, 68208, 69384, 70560, 71736, 72912, 74088, 75264, 76440, 77616, 78792, 79968, 81144, 82320, 83496, 84672, 85848, 87024, 88200, 89376, 90552, 91728, 92904, 94080, 95256, 96432, 97608, 98784, 99960, 101136, 102312, 103488, 104664, 105840, 107016, 108192, 109368, 110544, 111720, 112896, 114072, 115248, 116424, 117600, ...
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The factors are 1, 7 and 49. The multiples are 0, 49, 98, 147, 196 ... (just keep adding 49)
They can be and are.
None in that range.
There are four multiples of 12 between 150 and 200: 156, 168, 180, 192
A multiple has to be equal to or larger than the number itself, so there are no multiples for 359 that are between 49 and 95. 359 is a prime number, so it has no factors between 49 and 95 either.