Large prime numbers are used in encryption. The larger the primes, the better the encryption. Typically each of two people will provide a prime; you need to know both prime numbers to decrypt.
A program is used to calculate the values to be sent. The message is sent along with the product of the primes (sender's prime * receiver's prime). Since the number will be large it is difficult to crack (again, larger the better). To decrypt you have to know both prime numbers. Knowing one and the product makes it easy (just divide). If you only have the product, decrypting can be very time-consuming as you are forced to find the factors of the number
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Any situation numbers are used.
Prime numbers are used to find the LCM of numbers Prime numbers are used to find the HCF of numbers Prime numbers are used to simplify fractions Prime numbers are used to find the LCD of fractions
Prime numbers are used to find the product of the prime factors of composite numbers.
Prime numbers and composite numbers are not used in daily jobs. However they are used by scientists to prove theorems.
1 Prime numbers have only 2 factors which are themselves and one 2 Prime numbers can't be composite numbers which have more than 2 factors 3 Prime numbers are odd except for two which is the only even prime number 4 Prime numbers are used in finding the LCM of 2 or more numbers 5 Prime numbers are used in finding the HCF of 2 or more numbers 6 Prime numbers are used in finding the LCD of fractions 7 Prime numbers are used in reducing fraction to their lowest terms 8 Prime numbers are rational because they can be expressed as fractions 9 Prime numbers are infinite 10 Prime numbers are irrational when square rooted 11 Prime numbers can't be 0 or 1 which are also not composite numbers 12 Prime numbers don't follow a forecasted numerical pattern 13 Prime numbers make up 25% of the first 100 integers or whole numbers 14 Prime numbers have a code amongst themselves that has never been cracked