All numbers of the form 63*k where k is any integer.
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No
67 is a prime number, but 21 isn't. A prime number can only be evenly divided by '1' and itself. 21 can be evenly divided by 1, 3, 7, and 21.
The number 63 can be evenly divided by 1, 3, 7, 9, 21, and 63.
36.8571
48