What's a Prime Number?

Click here for the full version: http://vn2.me/zut

Prime numbers aren't too hard to define, but they still puzzle professional mathematicians. Believe it or not, all over the word computers are chugging away, trying to find the next biggest prime! Bigger and bigger prime numbers help keep your credit card info safe through really cool encryption techniques. So prime numbers really matter every day, and you can learn how they are defined in this tutorial.

Category:

Education

Tags:

• math
• tutorial
• algebra
• concept
• help
• prime
• prime number
• no
• factors

[hathwit7]

Wtf is a factor? And ytf can't it go in four??!

[VirtualNerd]

@hathwit7 You can build up numbers by multiplying smaller numbers together. For example, you can build up 12 as 2 times 6, or 3 times 4. Those smaller numbers that multiply together to give you the bigger number are factors of the bigger number.

Your question is a good example of why we built our main site. With youtube, you may have a question like "what is a factor", but there is no clear way to answer that question. On our site, we have direct links to common questions to help you learn:)

[binasheikh1974]

Could you pls help my daughter in finding out if a larger number say 599 is prime number or not. Is there some formula that can be taught?

[VirtualNerd]

@binasheikh1974 That's a great question. Prime numbers are a bit of a mystery, because no one has figured out a formula for finding prime numbers, but there is a strategy that works well. The key is to try to factor the number, and see if it has factors other than 1 and itself. If it doesn't then it's a prime number! For 599 you just check the factors from 1 to 24 (up to square root of 599). Check out our website for more about factors. Search for virtualnerd online, and you'll find us:)

[LiveLushLoveLife]

thankyou that helped me alot and i will start to watch your videos your fantastic! x

[VirtualNerd]

@LiveLushLoveLife No problem, we're glad you liked it. We have a lot more tutorials on our main site, just search for virtualnerd on google and you'll find our main site. Also, we have a summer special designed to help you keep your skills fresh before school start up again. You can learn more about it on our Facebook page, so check that out:)

[ps3isstupid009]

yes waste ur time teaching dumbasses how to count

[Sandcat87]

@hathwit7 It just means divisible by. i.e. 4 is not only divisible by 4 and 1, but also 2. I don't know why they can't just say "divisible by" at any stage during this clip, or even responding to you.

[NerdDog16]

omg marry me

[Carlos80577]

For all n> 1, there is a prime number (p1) such that:

2n <p1 <3n, and another cousin (p2) such that: 3n <p2 <4n

example:

8 <11 <​12

12 <13 <16

This is known as the generalized conjecture Bertrand postulate.

[23flamenco23]

vean: luisprimenumbers.blogspot.com

[zafeamoon]

@hathwit7 factors are like saying the factors that add up to 4 are like 2 plus 2

[GamingLogics]

to shorten it down a prime number is something that isn't a multiple of something else only its own multiples.

[JennaStrawberryLove]

Thx ! So its just 2 thats an even # just asking :-)

[WOLFDARKBLADE900]

Thanks You Just Finish My Homework

[mrfishy217]

thanks babe that really helped