3 x 2 x 1 ie 6
First digit can be one of 3, 4 & 7, second one of the remaining 2 digits...
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Yes, the number 743 is prime.
440 or 541 or 642 or 743 or 844 or 945
the answer is 10.62 hours in 743 miles
I think you are talking about three numbers 743, 142, and 986425. If the least significant digit in a number is odd, the number is odd. If the least significant digit in a number is even, the number is even. You can also divide the number by 2 and if two goes into the number evenly without a remainder then the number is even. If there is a remainder, the number is odd.
743 is a prime number.