# Is it Prime? — user reviews

> 14 indexed App Store user reviews of Is it Prime? by Wismar, rated 3.20/5 from 5 ratings.

- Source: https://appshunter.io/ios/app/is-it-prime/id326095651/reviews
- App overview in markdown: https://appshunter.io/ios/app/is-it-prime/id326095651.md
- Rating breakdown: 5★ 2 · 4★ 1 · 3★ 0 · 2★ 0 · 1★ 2

## Most critical reviews (10 lowest-rated)

### 1/5 — Seems broken

*2018-04-15*

Try putting in 3141592653

### 1/5 — Wha?

*2014-04-16*

I enter a number, it ignores it and tells me another number is prime. Useless.

### 3/5 — Good

*2011-12-09*

It would be awesome if it could tell u its factors to

### 3/5 — Good

*2010-08-10*

But freezes up with big numbrs

### 4/5 — Yay!

*2017-11-18*

So happy to see an update to this handy little app. Helping my kids with math homework has been way easier since I downloaded it years ago. Thanks!

### 5/5 — Good

*2025-03-15, version 2.0.29*

This does exactly what it says on the tin! No ads,or add ons, simple and clean

### 5/5 — Love this app!

*2019-05-31*

I got this app years ago and I have never had a problem with it.  I am surprised there aren’t more users.  I teach math and have used it more than once for really large numbers.

### 5/5 — I Love It!

*2012-12-11*

I have a little obsession with prime numbers, so this app is great fun for me.  Back in high school (in 1975) I was in the first computer programming class in the LAUSD.  I wrote a little program to give me a list of prime numbers.  The program would be run, at night, on the school districts IBM 360, and took forever (many minutes) just to calculate a number as small 103.  This app handles much much larger numbers with ease, in fractions of a second.  I love it!

### 5/5 — Great

*2012-05-11*

Great app! My only complaint is that when a number is composite, the app doesn't give you its prime factorization. For example, it'll say 12 = 2*6 instead of 12 = 2*2*3

### 5/5 — Works good

*2012-04-10*

Very awesome I needed it for homework and it helped me!!! 5Stars!!!

## Most praised reviews (4 highest-rated)

### 5/5 — This app is worth it!

*2010-08-31*

This app shows how such a simple app can serve such an important purpose in your life.  I rarely give out 5 star ratings but this app had simplicity and also acts as a math guide.  Saying that I think this app is creative and worth the extra space on your iPhone/ iPod touch I also think that This app will be helpful to many people.  This app is very enjoyable but sadly I would not pay $0.99 for this easy, creative, helpful application.
I hope this review helps all,
Senorpantz21

### 5/5 — Helps A LOT

*2010-01-28*

Thanks Sooo much dude u r so geniu man! ™®

### 5/5 — Awesome

*2009-08-19*

It does as it says. Great timing. I am helping with homework. Thanks.

### 5/5 — Great

*2009-08-16, version 0*

Plain and simple and does what it says to do.
Also usefull for a book I'm reading "the curious incident of the dog in the night-time"

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*