Open Source C# Solution for IsPrimeNumber Console App Allows to check if Prime Number, numbers in range: 0 to 18446744073709551557. Implemented algorithms check one number with the mentioned magnitude in times on the Laptop with Processor(Intel(R) Celeron(R) N4020 CPU 1.10GHz 1.10 GHz): 10000019 - 7 Zeros - 0 Milliseconds 100000007 - 8 Zeros - 1 Millisecond 1000000007 - 9 Zeros - 5 Milliseconds 10000000019 - 10 Zeros - 12 Milliseconds 100000000003 - 11 Zeros - 29 Milliseconds 100000000003 - 11 Zeros - 29 Milliseconds 1000000000039 - 12 Zeros - 72 Milliseconds 10000000000037 - 13 Zeros - 291 Milliseconds 100000000000031 - 14 Zeros - 787 Milliseconds 1000000000000037 - 15 Zeros - 1 Second and 697 Milliseconds 10000000000000061 - 16 Zeros - 5 Seconds and 322 Milliseconds 100000000000000003 - 17 Zeros - 22 Seconds and 226 Milliseconds 1000000000000000003 - 18 Zeros - 53 Seconds and 116 Milliseconds Version 2.0 contains fourth algorithm of determining primality and has implemented Console mode in which it is possible to determine many different numbers, application can find given amount of prime numbers bigger than specified number and provides times for each of the performed operation.