743 is a Prime number.
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743 is a prime because it has no factors other than 1 and itself. One way to verify this is to try dividing 743 by each of the primes less than the square root of 743 (approximately 27).
0.004
743! = 1.988481801120 E+1812
743 x 654 = 485,922
465 x 743 = 345495