This number is a composite.
99918 has 5 distinct prime factors; 9918 has 4; 918 has 3; 18 has 2; and 8 has 1 prime factor. This is the largest such number. [Gupta]
99918 has 5 distinct prime factors; 9918 has 4; 918 has 3; 18 has 2; and 8 has 1 prime factor. This is the largest such number. [Gupta]