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Is there more prime numbers then composite numbers?
There are many, many more composite numbers than prime numbers. For example, beyond the number 3, every other number is composite, as it is divisible by 2. Following this, every number ending with a 5 other than 5 itself is composite, as it is divisible by 5, and every third odd number is divisble by 3. There are many complicated divisibility tests for numbers above 5.
Composite numbers for 25?
1, 5, 25
Are the numbers 71113 plus 13 and 7654321 plus 5 composite?
71113 + 13 = 71126 which is a composite number. 7654321 + 5 = 7654326 which is a composite number.
What are the smallest composite numbers?
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.
Are all numbers with a 0 in the ones place a composite numbers?
Yes. All numbers with 0 in the one's column are composite, having at least the factors of 1, 2, 5, and itself. The number 0 is also composite, having all numbers as factors.
