GRE Arithmetic: Integers (Part 4 of 4)

This video tutorial covers special integers, focusing on even, odd, prime, and composite numbers. It explains the properties of even and odd integers, such as their behavior in addition and multiplication. The video introduces prime numbers, detailing their characteristics and providing examples. It also covers prime factorization, demonstrating how to break down numbers into their prime components. Finally, the video explains composite numbers and lists examples. The tutorial aims to prepare students for integer-related questions in the GRE revised test.

What is the result when you add two odd numbers together?

• A composite number

• A prime number

• An even number

• An odd number

Which of the following is a characteristic of a prime number?

• It is always a composite number

• It has more than two divisors

• It is always an even number

• It is divisible by 1 and itself only

Which number is the only even prime number?

• 1

• 4

• 3

• 2

What is the prime factorization of 81?

• 3 x 3 x 3 x 3

• 9 x 9

• 3 x 27

• 1 x 81

How can you determine if a number is divisible by 3?

• If it is a prime number

• If it is an even number

• If the sum of its digits is divisible by 3

• If it ends in 0

What is the prime factorization of 338?

• 13 x 26

• 2 x 169

• 2 x 2 x 84.5

• 2 x 13 x 13

Which of the following numbers is a composite number?

• 4

• 3

• 5

• 2