105 is not a Prime number. You can readily see that 3 and 5 go into it, and 7 goes into it too. The number ends in 5, and 5 goes into any number ending in 0 or 5. The sum of the digits is 6, and when the sum of the digits is divisible by 3, then so is the original number.
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105 is not a prime number among them. It is because it is divisible by 5.
Assuming you meant 101, 103, 105 & 107... The number 105 is not prime - as it will divide by 5 or 3.
97 101 103
The prime numbers between 80 and 105 are: 83, 89, 97, 101, 103
Eleven numbers less than 105 are relatively prime to 105. They are 82, 83, 86, 88, 89, 92, 94, 97, 101, 103, and 104.