# What is a Prime or Composite Number? Quiz, Video and Calculator

## What are Prime Numbers?

All the numbers that are not divisible by any number (*except the number itself and 1*) are known as Prime Numbers. For example, 3, 2, 7, 17, and so on…

**In other words**: Prime numbers are only those numbers that have only 2 divisors or factors: Number itself and 1. For example, 2 can only be divided by 2 and 1.

## What are Composite numbers?

Composite numbers are those numbers that can be divided by other numbers (Not just by 1 or number itself).

**In other words:** All the numbers that can be divided by at least 3 numbers are called Composite numbers. For example, 4 can be divided by, 1, 2, and 4. So we have 3 divisors here. That makes 4 a Composite number.

### Is number 1 a Prime or Composite Number?

No, Number 1 is neither prime nor composite numbers. This is because number 1 doesn’t have 2 divisors ( number itself and 1) that are the condition to be a prime number. Number 1 has just one divisor and its number itself.

Number 1 is not a Composite number because it doesn’t fulfill the criteria to have at least 3 divisors (number itself, number 1, and any other number).

### What is the lowest Prime and Composite number?

- Lowest Prime Number: 2
- Lowest Composite Number: 4

## Learn Prime and Composite Numbers With This Quick Video

## Prime and Composite Number Quiz

Let’s find out what your have learned. Answer correctly to score. To replay this quiz, just reload the page.

## Prime and Composite Number Identifier (Calculator)

You should avoid using this if you want to learn. This may be used only for the purpose to match the answer if you got it correctly and not to just copy the answer.

**Type a number and Press Enter**

**Related:** **Prime Factorization**