3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45.
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Yes, all numbers greater than 1 are.
45 1*45 = 45 3*15 = 45
15, 30, 45, 60, 75, 90
Any single number has an infinite number of multiples. For example, 45 x 1 = 45, 45 x 2 = 90, 45 x 3 = 135... and so on.
All the multiples of 5 between 1 and 51 are: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 These add up to 275.