Only 63 is a composite. 63 = 3 x 3 x 7
The other three numbers (13, 31, 61) are all prime numbers.
63 is the only composite number in that list.
61
The numbers are increasing by increments of 13 and so the next number is 61+13=74
the series is 2n+3 with n being the previous number 2(5)+3=13 2(13)+3=29 2(29)+3=61 2(61)+3=125 2(125)+3=253<----answer
A prime number is a whole number that only has two factors which are itself and one. A composite number has factors in addition to one and itself. The numbers 0 and 1 are neither prime nor composite. All even numbers are divisible by two and so all even numbers greater than two are composite numbers. All numbers that end in five are divisible by five. Therefore all numbers that end with five and are greater than five are composite numbers. The prime numbers between 2 and 100 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97.
13 prime 63 composite 61 prime 31 prime Well the question should have been either, Which one of these numbers is not a composite number? Or, Which one of these numbers is not a prime number?
31 and 61 are prime, the rest composite.
1891 is not prime. 1891 = 31 * 61
is the number 61 composite? no. it comes to the conclusion that is not composite because it is not divisible with any other number. Thus, 61 is a prime number. it is only divisible by 1 and 61
A composite number is a positive integer greater than 1 that has more than two distinct positive divisors. In this case, 63 is a composite number because it can be divided evenly by 1, 3, 7, 9, 21, and 63. The other numbers listed (13, 61, and 31) are all prime numbers because they only have two distinct positive divisors, 1 and the number itself.
61 is a prime number
8143144792574020282236217021 is not prime. 8143144792574020282236217021 = 13 * 19 * 61 * 631 * 856517044004715575473
61 is prime.
61
51 is a composite number but 61 is a prime number
61 is prime
51 is composite.