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.
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100 is a composite number. A Prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
Out of those 100 numbers, 21 of them are prime numbers, so the remaining (100 - 21) = 79 are composite.
So we eliminate prime numbers. Note that the number 1 is neither prime nor composite. We have left:4689101214151618202122242526272830323334353638394042444546484950515254555657586062636465666869707274757677788081828485868788909192939495969899100
The product of two prime numbers will be composite.
It is: 25*75 = 1875
Products of prime numbers are composite numbers.