Q: Is 4a2-21a plus 5 prime

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Since 5 is prime, only 5 and 1 are its factors. 5 is a prime number, all prime numbers are divisible by only itself and 1. 5 is a prime number, all prime numbers are divisible by only itself and 1.5 (1 is not prime)5 is a prime number. It has no other prime factors.

The prime factorization of 125 is: 5×5×5

The only prime multiple of 5 is 5.

yes 5 is a prime number,because it is divided by itself

It is prime because its multiples are 1 and itself that is a prime number

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(r + 1)(2r + 5)

that would be 215, so no. it is divisible by 5, so that means it is not prime.

n = 5.

Yes for example 5+11 = 16

But 5+5 = 10 and 5 is a prime number

2 + 3 = 5 Two plus any odd prime number is odd.

2 x 3 x 5 + 1 = 31

A prime plus another prime is at the very least going to be an even number since all primes (with the exception of 2) are odd.

It would be composite because a=1 and b=5 so it would be 3+1+6+5=15, and 15 can be divided by 3 into 5.

9x2 + 48xy + 64y2 = (3x + 8y)2. Since it is a squared number cannot be a prime. We can say that as a perfect square number, it is formed by the sum of 1 and some prime numbers (excluded 2), i.e 1 + 3 + 5 + 7 + 11 + ... n, where n is a prime.

It is: (x+1)(x+4) none of which are prime numbers

5, 7, 11, 13, 17, and 19; plus 3 if you are including it.