10000

This number is a composite.

The first known prime triplet with more than 10000 bits is 813529138*1939938^500 -1 , +1, +5. [Luhn]

10000+9000+8000+7000+6000+5000+4000+3000+2000+1000 plus 1 is prime. [Silva]

10000 minus 2468 (the concatenation of the four single-digit even numbers in ascending order) is the four single-digit prime numbers in descending order. [Homewood]

The term gigantic prime (a prime number with at least 10,000 decimal digits) was coined by Samuel D. Yates.

10000 plus 123456789 is prime. [Silva]

The First 10,000 Primes.