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It is quite simple when you note that the sum of the first n odd numbers is n2.
That is
1 = 1 = 12
1 + 3 = 4 = 22
1 + 3 + 5 = 9 = 32
It can be proven that this is always true (but not now).
So if you go to 100, you are adding to the 50th odd number.
And, therefore, the sum is 502 = 2500
All of the odd numbers.
answer:2500
If the question is about the product of all odd digits, the answer is 945. Otherwise the question does not make sense.
Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
The sum of all odd numbers 1 to 120,000 is 14,400,000,000.