• Dictionary
• Thesaurus
• Scrabble
• Spanish Central
• Learner's Dictionary

# prime number

noun

## Simple Definition of prime number

• mathematics : a number (such as 2, 3, or 5) that can only be exactly divided by itself and by 1

Source: Merriam-Webster's Learner's Dictionary

## Full Definition of prime number

1. :  any integer other than 0 or ± 1 that is not divisible without remainder by any other integers except ± 1 and ± the integer itself

1570

1570

noun

## Definition of prime number for Students

1. :  a number (as 2, 3, or 5) that results in a whole number from division only when it is divided by itself or by 1

## Seen and Heard

What made you want to look up prime number? Please tell us where you read or heard it (including the quote, if possible).

#### vamoose

play

to depart quickly

Get Word of the Day daily email!

#### WORD GAMES

Take a 3-minute break and test your skills!

Which is the correct spelling?

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

#### Words at Play

##### 'Dumbledore', 'Hippogriff', and 11 More Real Words from Harry Potter

The history behind Harry Potter

##### The Original Hipsters

Hint: they carried things on their hips

##### 'Between You and I'

Don't let this phrase come between you

##### How to Use the Subjunctive in English

If I were you, I'd watch this

##### How Often Is 'Biweekly'?

Don't get us started on 'bimonthly'

##### Irregardless

It is in fact a real word (but that doesn't mean you should use it).

##### Weird Plurals

One goose, two geese. One moose, two... moose. What's up with that?

#### Word Games

##### Difficult Spelling Words Quiz

Can you spell these 15 tricky spelling words?

Take the quiz
##### Who Knew?

Take this quiz and discover 12 words for things you didn't know had words.

Take the quiz
##### Name That Thing

Test your visual vocabulary with our 10-question challenge!

Take the quiz