Which is a prime number 234 OR 788 OR 123 OR 563?

Answer 1

The only even prime is 2, so neither 234 nor 788 is prime. Since 1+2+3=6 is divisible by 3, the divisibility test for 3 says 123 can not be prime. If one of the options must be prime, then we know it is 563. Just to check:

563 is odd and not divisible by 3,5,7,11,13,17,19, or 23. Since it is not divisible by any primes less than its square root, we know that 563 is not divisible by any whole numbers other than itself and one and is hence prime.

Answer 2

Among the numbers provided, 563 is a Prime number. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. In this case, 563 cannot be divided evenly by any other number than 1 and 563, making it a prime number.

Answer 3

Oh, dude, let me drop some math knowledge on you. So, a prime number is a number greater than 1 that can only be divided by 1 and itself. Out of those options, 563 is the only prime number. The rest are just hanging out, being all divisible and stuff.