This number is a composite.
The smallest number that can be written as q * pq + r * p r, where p, q and r are distinct primes (184 = 3 * 23 + 5 * 25). [Thoms]
2184 with the last digit removed is prime. [Blevins]
(There are 2 curios for this number that have not yet been approved by an editor.)
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