If it is only divisible by 1 and itself.
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a prime number
A composite number.
A prime number is an integer, greater than 1, which is only divisible by 1 and by itself.A prime number is an integer, greater than 1, which is only divisible by 1 and by itself.A prime number is an integer, greater than 1, which is only divisible by 1 and by itself.A prime number is an integer, greater than 1, which is only divisible by 1 and by itself.
39 is composite... --------------------- A prime number is a whole number greater than 1, whose only two whole-number factors are 1 and itself.
53 is a prime number that is greater than 50