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No, it is not possible. Every multiple of 21 is a composite number.
21 is a composite number and its factors are 1, 3, 7 and 21(4 factors). Any multiple of 21 must have all the factors of 21. So, every multiple of 21 has at least 4 factors.
And a Prime number has only two factors so, any multiple of 21 can't be prime.
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