This number is a composite.
Just showing those entries submitted by 'Silva': (Click here to show all)
The number of 4-digit primes formed from the first 4 odd digits. [Silva]
4!!-3!!+2!!-1!! is a 4!-digit prime. [Silva]
4 is the number of primes formed from 4 digits summing up to 4 [Silva]
The only digit that forms a prime with the previous digit (43). [Silva]
4 is the number of 4-digit primes formed from the first 4 natural numbers: 1423, 2143, 2341, 4231. [Silva]