It is a Prime number.
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43 is prime; 39 is composite.
43 is a prime 33 is composite
43 is prime.
301 is not prime. 301 = 7 * 43
43 is a prime number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.