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What do 3 5 7 11 and 13 have in common?
They are all odd, and they are all prime numbers
What is a counterexample of all odd numbers are prime?
9 = 3*3 and so it is not a prime.
What are all the prime numbers from 1-5?
The prime numbers from 1 - 5 are 2, 3, and 5.
Are all numbers ending in 1 prime?
No 21 isn't (= 3 x 7) 51 isn't (= 3 x 17) 81 isn't ( = 9 x 9)
Can a whole number ending in 8 be a prime number why?
No, 8 is an even number. ALL prime numbers are odd numbers (excluding 2), that does not mean, however, that all odd numbers are prime numbers. Prime numbers do not have any divisors, even numbers do. Let's say the this number is 18. We know 1 and 18 are one set of divisors. But there are more: 2 and 9, and 3 and 6, thus concluding it is not a prime number. Short list of prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53... and by now you should have noticed the pattern--all numbers that end in 1, 3, 7, 9 are prime.
