2 is prime.
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2 x 2 = 4 2 x 5 = 10
Prime numbers are: 2 3 5 7 Composite numbers are: 4 6 8 9 10 So the ratio is: 4 to 5
1-10 AD had the years 2, 3, 5, and 7, which were prime numbers.
Prime numbers: 2 3 5 and 7 Composite numbers: 4 6 8 9 and 10 Note that 1 is neither a prime or a composite number
There are 4 prime numbers under ten.