1 is special
2 prime
3 prime
4 composite
5 prime
6 composite
7 prime
8 composite
9 composite
10 composite
11 prime
12 composite
ext.
9
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,and 97 are all prime numbers. The rest are composite
Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
They are the numbers that have more than two factors whereas prime numbers have only two factors and that 1 is not considered to be a composite or a prime number
primes are 1,2,3,5,7,11,13,17,19,23,29,31,41,43,47,53,59,61,67,71,73,79,83,89,91. all others are composites.
There are 25 prime numbers and 75 composite numbers from 1 to a 100. A prime number has only two factors whereas a composite number has more than two factors.
finding the prime factors of a composite number
9
101
75 composite numbers are there till 100. 100-25=75. Composite numbers are numbers greater than 1 but not prime numbers.
The factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50, 100 2 and 5 are prime. 1 is neither. The rest are composite.
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,and 97 are all prime numbers. The rest are composite
Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
So we eliminate prime numbers. Note that the number 1 is neither prime nor composite. We have left:4689101214151618202122242526272830323334353638394042444546484950515254555657586062636465666869707274757677788081828485868788909192939495969899100
It is: 25*75 = 1875
They are the numbers that have more than two factors whereas prime numbers have only two factors and that 1 is not considered to be a composite or a prime number
primes are 1,2,3,5,7,11,13,17,19,23,29,31,41,43,47,53,59,61,67,71,73,79,83,89,91. all others are composites.