Which of the numbers in questions 1-3 are prime numbers?
2 and 3 are prime numbers and any number that has only two factors is also a prime number
13 is a prime number 13 is a prime number, because there are no two numbers that multiply to get 13. It is a prime number because no number can go into it or be multiplied and the answer be 13. Only two numbers go into 13. The two numbers: 1;13 One and thirteen (itself) 1 is neither prime or composite. So concluding, 13 is a prime number.
Prime numbers are the numbers that can only be divided by 1 and them selves. As in 13 if you were to factor it using only whole numbers you would see that its factors are only 1 and 13. There for it is prime. While 12 you see that the factors are 1,2,3,4,6,12 meaning that it is not prime. You test several numbers, to see whether they are prime numbers, until you find a prime…