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Q: What is the prime number of 100 sum of the digits is 4 and the tens digit is two more then the ones digit?

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I'm sure there are more than 2 prime numbers that are 400 digits long.

The number is 84.

We call them by the number of their digits. Two-digit number, three-digit number and so on.

If repeated digits are allowed, then the largest 12-digit number is 999,999,999,999 .If repeated digits are not allowed, then the largest 12-digit number is 989,898,989,898 .If the same digit can't be used more than once, then the largest possible number has only10 digits. The number is 9,876,543,210 .

There is no specific name: you just call it a number with 2 or more digits or a multi-digit number.

50

We generally refer to them by the number of digits. Two-digit number, three-digit number, etc.

17

Every square of a 4 digit number has more than four digits.

A quintillion is a number with 18 zeros (19 digits). A 20-digit number would be 10's of a quintillion (20 digits since we add one more digit to the left).

2.3

45 and 54

19

46.

The original number is 58.

43

The question cannot be answered. All that I know about your number is that is has at least 4 digits. Your number could be a hundred digits long - I have no way of knowing.

44

Everything that has 0 as its digit can be divided by both 2, and 5 as well as many more. Therefore it cannot be a prime number.

A number with more than one digits: that is, an integer greater than 9.

The number you're looking for is.... 19

The odd prime digits are 3, 5, and 7. but the final digit of your three-digit prime number can't be 5. So there are only 18 combinations to check. You can list these numbers and start going through them to see which are prime. The easiest test is divisibility by 3 (sum the digits) and that quickly eliminates 7 of them. You are left with:337353373533553x557577733737x757773Of these, only two are not prime. I marked them with an "x". I used a table of primes to find these and don't know an easier way.

In decimal, a digit is one of the ten symbols that represent the numbers 0 to 9. A number can be made up of one or more digits. For example: 1 is a digit (as well as a number of course). 11 is a number made up of 2 digits.

That refers to a number that has more than one digit. For example, 416 is a number; the individual symbols, 4, 1, and 6, are its digits. Since the number 416 has more than one digit, it is multidigit.

The number 50 is composite. Any two-digit (or more-digit) number that ends in zero can be divided evenly by 10 (and 5 and 2, for that matter). That means no two- or more-digit number ending in 0 can be prime.