# The solutions of the Quiz Questions - June

### What makes these green colored numbers special?

**The answer: **All the green colored numbers are prime numbers! As we you, prime numbers are only divisible by itself and 1. They play a very important role in online shopping and cryptography!

Which numbers are essential to online security?

**Answer:** Prime numbers play a very important role in online shopping and cryptography!

### What is the last digit of 2¹⁹?

**Answer:** We know that 2¹ = 2, 2² = 4, 2³ = 8, 2⁴ = 16, 2⁵ = 32. So the last digits of the powers of 2 have a pattern. And it is 2, 4, 8, 6, 2, 4, 8, 6, .... . So the 19th term is going to be 2.

### Which numbers are mainly focused on in the movie Cube?

In **the film "Cube**," characters move from cell to cell, and each cell is labeled by three **numbers**, with each of these **numbers** being in the range 1-999. The players realize that they need to avoid the cells that has a **prime** or a power of a **prime**.