1,999,998 has exactly 1,000,000 divisors starting with 1, 2, 4, 6, 8,...up to 1,999,998.
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The first number to have exactly 10 divisors is 48.
It is 192.
The only numbers which divide into 89 exactly are 1 and 89. These are called factors or divisors. Any number which has exactly 2 divisors (1 and the number itself) is a prime number.
I think you mean, the largest four digit number that has exactly three divisors. 2X3X1663=9,978
I guess that would be the number 6.