Prime No: between 1000 to 9999= 54_( 42x3)
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The prime numbers (factors) of 1000 are: 2 and 5
Not sure about the exact number but it is approx 1086.
There are 168 prime numbers between 1 & 1000.
The prime factors of 1000 are: 2, 5
-9999. Or, if only positive numbers are being considered, then, 1000.