7+1+1 = 9 so it is divisible by 9 and so not a prime.
135 is not prime. 135 = 3 * 3 * 3 * 5135 is a composite number because its factors are:1x1353x455x279x151, 3, 5, 9, 15, 27, 45, and 135.*NOTE: All numbers that have a 0 or a 5 in it are composite, except 5 because they will always have a third factor, 5.
225 is a composite number. This is because composite numbers are any number that has more than two factors (one and itself). Therefore, since there are many factors of 225 besides one and itself such as 3, 5, and 9, that makes it a composite number.
Yes. One of the reasons are that if you Google it, they say it's a composite #. Second, a prime number has 2 factors: 1 and itself. But 81 has 5 factors:1, 3, 9, 27, and 81.81 is a composite number 3 * 3 * 3 * 3 = 81
To be an even number then the final digit = 2. The largest single prime digit is 7 (as both 8 and 9 are composite). The greatest even number fulfilling the conditions is 77777772.
3 x 3 = 9 (Not a prime ; Composite) 1 x 19 = 19 ( Prime) 3 x 7 = 21 (Note a prime: Composite) 5 x 5 = 25 (Not a prime ; Composite).
It is a composite number.
A prime number is a number that is divisible only by 1 and itself; it has no other factors. A composite number is a number that is divisible by more than 2 numbers. The factors of 171 are 1, 3, 9, 19, 57, and 171. Therefore, 171 is a composite number.It is a prime number, because there is no other factors apart from 1 and itself, which is 171.171 is a composite number. The prime factors for 171 are 3, 3, and 19.3 x 3 x 19 = 171
It is a composite.
It is composite.
9 is a composite number
A prime number has only two factors, one and the number itself. A composite number has more than two factors. Prime number examples are: 2, 3, 7, and 19. Composite number examples are: 4, 9, 12, and 18.
9 is a composite 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.
A prime number is not divisible by any numbers except 1 and itself. A composite number is divisible by other numbers. 9 is divisible by 3, so it is a composite number.
The number 171 is composite because it can divide not just by 1 and 171 but 3, 9, 19 and 57.
All multiples of 9 are composite numbers; however, 9 itself is not a prime number. Its factors are 1, 3, and 9.
9 is a composite 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.