That would be 4, and 2; greatest common factor is 2.
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4 is the smallest positive composite number
The least 1 digit number that is composite is 4. It is because all numbers before that are prime.
Starting from beginning we see that 0 has infinite factors so it is a composite number and 1 is neither prime nor composite. The next number is 2 which has only two factors so it is the smallest Prime number.
1 cuz 1 is not a prime number but it is not a composite number neither
The smallest composite numbers are 4, 6, 8, 9, and 10. It should be noted that the number 1 is a unit, and is neither prime nor composite. The numbers 2, 3, 5, and 7 are all prime, leaving the remaining numbers as the 5 smallest composites.