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4 is not prime.
You would write it like this: 2345 < X. X being any number greater than 2345 including decimals.
There are 52.
2345
2345 + 2345 = 4690
Since the order of the digits does not matter there are only five combinations: 1234, 1235, 1245, 1345 and 2345.
514 441 3877
2 - 3 + 4 + 5
52 x 43 = 2236
2345-3456 = -1111
2345
No; 2345 is odd.