It is composite. It is divisible by 3, 9, 23, 27, 69, and 207.
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621 is not prime. 621 = 3 * 3 * 3 * 23
621 3, 207 3, 3, 69 3, 3, 3, 23 Note: 23 is a prime number
621 = 3^3 * 233 x 3 x 3 x 23 = 6213 x 3 x 3 x 23
Oh, dude, the highest common factor of 368 and 621 is 23. But like, who even needs to know that in real life, right? Unless you're planning a wild party with prime numbers, then maybe it'll come in handy.
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