A composite number is a positive integer greater than 1 that has more than two distinct positive divisors. In this case, the number 51 is a composite number because it has divisors other than 1 and itself, such as 3 and 17. Numbers 31, 41, and 61 are all prime numbers, as they only have two distinct positive divisors, 1 and the number itself.
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51 is composite. 51 = 3 x 17.
The other three numbers are prime numbers.
If you mean: 53 81 41 47 and 31 then 81 is a composite number while all the rest are prime numbers
31, 37, & 41 are prime; 32,33,34,35,36,38,39 & 40 are composite.
41 is a prime number. It has no composite numbers as factors.
Of these, 45 is the only composite number. All the others are prime.
Composite numbers are positive integers greater than 1 that have more than two factors. Between 31 and 41, the composite numbers are 32, 33, 34, 35, 36, 38, 39, and 40. These numbers can be divided by numbers other than 1 and themselves, making them composite.