4 is the least one digit composite number
The ratio of the number of one-digit prime numbers to the number of one-digit composite numbers is one to one. The one-digit prime numbers are 2, 3, 5, and 7. The one-digit composite numbers are 4, 6, 8, and 9. Therefor, the ratio is 4:4, which simplifies to 1:1.
There are four of each.
9
867 is a prime number but 504 is obviously a composite number because its last digit is an even number so 2 is one of its factors.
16 is a composite number because it has at least one positive factor other than one or itself.
The largest single digit composite number is 9. The largest prime number is 17 million digits long. The definition of a composite number is any number that has at least one positive divisor other than one or the number itself (it is not a prime number). The largest composite digit is therefore longer than the largest prime number by at leaf +1.
The ratio of the number of one-digit prime numbers to the number of one-digit composite numbers is one to one. The one-digit prime numbers are 2, 3, 5, and 7. The one-digit composite numbers are 4, 6, 8, and 9. Therefor, the ratio is 4:4, which simplifies to 1:1.
There are four of each.
9
There are 69 of them: one such is 12.
One hundred is the least three-digit square number. It is formed by 102.
4
32 is a composite number because it has at least one positive factor other than one or itself.
33,372 is a composite number because it has at least one positive factor other than one or itself.
747 is a composite number because it has at least one positive factor other than one or itself.
If it is a composite number, it is divisible by at least one prime number.
45 is a composite number. A number is composite if it can be evenly divided by and least 3 numbers (if it has at least 3 factors). Any composite number has at least one factor other than one and itself. 45 has 6 factors: 1, 3, 5, 9, 15, and 45.