# Prime Numbers - Page 3

Questions

- What are the even composite numbers from 50 to 80?
- What is the 15th prime number, if they are listed in order?
- Is 25 a composite number?
- Is 43 a prime number?
- Which of these numbers is a prime number 1, 11, 21, 51?
- What are the numbers that have exactly 5 factors?
- What are prime numbers?
- Is 199 a prime number?
- Why is 99 a composite number?
- Is 91 a prime number?
- Is 121 a prime number?
- In the three-digit integer 735, the digits are all different and the hundreds digit and the units digit are both prime. How many three-digit integers have digits that are all different and have both prime hundreds and units digits?
- What is a prime number between 10 and 20?
- What is a composite number between 70 and 80?
- The high school band has 12 more girls than boys. The band has a total of 106 students. How many boys are in the band?
- Is 109 a prime number?
- What is a composite number between 20 and 40?
- Two and three are consecutive prime numbers. Why aren't there any other pairs of consecutive prime numbers?
- Is 77 a prime or composite number?
- Is 17 prime or composite?