What is a prime number?
Is 21 a prime or a composite number?
Is 23 a prime or a composite number?
All prime numbers are odd except .
Determine whether the number 226 is prime, composite, or neither.
Caribou calves weigh about 13 pounds at birth. Is the number 13 a prime or a composite number?
A teacher asked her class to color all the prime numbers between 1 and 10. Here are some of their answers. Which one is correct?
Michael is learning about prime numbers. He knows that 5 is a prime number, because the only factors of 5 are 1 and 5.
Is 9 a prime number? Why?
Benjamin says that 1 is a prime number because it only has 1 factor pair.
Is he correct? Why?
Madison says that every even number is composite because 2 is a factor.
Is she correct? Why?
Isabella bought these four raffle tickets, and one of them was the winning ticket.
The table shows all the factors of some numbers.
|Factor of||1, 101||1, 7, 19, 133||1, 157||1, 5, 29, 145|
Which of the numbers are prime?