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The first two-digit prime number is 11.
1348.
The first three-digit number is 100. It is the smallest integer that has three digits, starting from 1 and followed by two zeros. Numbers below 100, such as 99, are considered two-digit numbers.
In such cases, you should compare one digit at a time, from left to right, until you find a digit that is different in the two numbers. That is, compare the first digit (after the decimal period) with the first digit, the second digit with the second digit, etc.
101 is the first three-digit prime number.