43 is.
43 is.
43 is.
43 is.
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43 is the prime number.
43 is prime; 39 is composite.
There is an infinite number of prime numbers that are greater than 21. The next prime number after 21 is 23.
43 is a prime number.
Its in its simplest form because 43 is a prime number,which means only 1 and its self can go into it .