There are 14 numbers between 1 & 100 that are divisible by 7.
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Oh, dude, you want me to do math? Fine, fine. So, like, numbers divisible by 3 under 100 would be 3, 6, 9, all the way up to 99. There you go, a list of numbers that can be divided by 3 without breaking a sweat.
Clearly, both 810 and 910 are divisible by 5. A wee trick regarding numbers that are a multiple of 3, is that the component numbers, when added together, are divisible by three. So, 654 is divisible by 3, as 6+5+4 = 15 which is divisible by 3. In your example, 810 components add up to 9, which is divisible by 3. But the components of 910 add up to 10 which is not so divisible.
Prime numbers go on forever.
No, even numbers are evenly divisible by two, which means that only the multiples of two are even numbers. Odd numbers make up the other integers. There is no such thing as an odd or even decimal.
There are 25 prime numbers up to 100. They are 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.