Home › Free Online Games › Words & Numbers

Prime or Not

Is the number prime? Decide in a blink and keep your streak going.

Free · No download · No sign-up · Your best score is saved in this browser

How to play Prime or Not

A number appears. Tap Prime if it can only be divided by 1 and itself, otherwise tap Not prime. Numbers grow as you score. You have 45 seconds and three lives.

About this game

Prime or Not is a free browser game in our Words & Numbers collection. It is a word and number game that rewards vocabulary, mental arithmetic or a cool head for odds. It runs on phones, tablets and computers, needs no app, and has no in-game purchases.

Controls adapt to your device: tap or swipe on a touch screen, or use the mouse and keyboard on a computer. Use the buttons at the top of the game to restart, switch the sound off, or go full screen.

More games like this

Words & NumbersWord RainWords fall from the sky. Type them before they hit the ground.Words & NumbersCipher QuoteEvery letter has been swapped for another. Crack the code to read the saying.Words & NumbersVowel FillThe vowels have vanished. Work out the word from its consonants alone.Words & NumbersTarget NumberCombine six numbers with plus, minus, times and divide to hit the target.Words & NumbersMake 24Use all four numbers and basic maths to make exactly 24.Words & NumbersLast StickTake turns removing sticks. Whoever is forced to take the last one loses.ArcadeReaction AceHow fast are your reflexes? Tap the moment the screen turns green.ArcadeBeat LanesHit the falling notes on the line in this four-lane rhythm test.PuzzleEcho PadsWatch the pads light up, then repeat the growing sequence from memory.BrainMath DashSixty seconds of quick-fire sums. How many can you solve?

See all 102 free games →