7, 17, and 37 are all prime numbers.
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21 is not a prime number because it is 3 x 7
7, 17, 37, 47.You can get this from any table of prime numbers.
There are an infinite number of them. A few are 7, 17, 37, 47, 67, and 97.
1813 is not prime. It is composite its factors are 72 , 37 7 x 7 x 37 = 1813
3367 is a composite number. Its prime factors are 7, 13, 37