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Would the number 0 be a prime number?
No.
What number would be a counterexample to the following conjecture Prime numbers are odd?
2 would be a counterexample to the conjecture that prime numbers are odd. 2 is a prime number but it is the only even prime number.
How many factors to each prime number have?
Prime numbers have as factors the number 1 and their own number. Example: 37 is a prime number because its only factors are "1" and "37". If the prime number had further factors, it would no longer be prime.
Is 74 prime number?
No It is not a prime number. There are two ways you can tell its not prime. First of all, their is only one even number that is prime, and the number would be 2. Second, 74 is a composite number, therefor it cannot be prime. Hope it helps you a bit :)
What is the greatest number to test whether 2558 is prime?
To determine if 2558 is a prime number, you would typically test divisibility by numbers up to the square root of 2558. The square root of 2558 is approximately 50.58. Therefore, you would test divisibility by prime numbers up to 51. The greatest prime number less than or equal to 51 is 47, so you would test divisibility by 47 to determine if 2558 is a prime number.
