1009
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The least 1 digit number that is composite is 4. It is because all numbers before that are prime.
73 7-3 = 4 73 is prime and 37 is prime.
1150. because product of 3 x 5 x 7 x 11=1150, which is the least 4 digit number which can be expressed as product of primes.
The smallest prime factors are 2,3,5,7 thus the smallest number would be the product of these will be 210
1000