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Q: What is the least 4 digits prime numbers?

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there are 4

numbers that do not end in 0, 2, 4, 5, 6 or 8; numbers whose digits do not total 3 or a multiple of 3

There is no such number. A prime number cannot be divisible by 4. If the product of the digits is less than 5 and there are only two digits, the possible digits could be {0, 1}, {0, 2}, {0, 3}, {0, 4}, {1, 1}, {1, 2}, {1, 3}, {1, 4}, or {2, 2}. Thus, the possible numbers are 10, 20, 30, 40, 11, 12, 21, 13, 31, 14, 41, or 22. The prime numbers among these numbers are 11, 31, and 41. The numbers divisible by 4 among these numbers are 20, 40, and 12.

4 is not prime.

Numbers that are not prime are numbers that are divisible by integers other than one and itself. Since there are a boatload of these numbers, I will try to keep it brief:All integers with the last digit 2, 4, 6, 8, or 0 (besides 2 and 0 themselves) are not prime. (Numbers that are not prime are composite. Numbers ending in 2, 4, 6, 8, or 0 are always divisible by at least the number 2, hence they are not prime.)All integers ending with 5 (besides 5 itself) are not prime (these numbers are always divisible by at least the number 5).Everything else varies, though. For example, with digits ending with 3, 33 is not prime (divisible by 3 and 11), but 13 is prime. With 7, 17 is prime, but 77 is not (divisible by 11 and 7). Also, two-digit integers with identical tens and ones-place digits are not prime (with the exception of 11); these are all divisible by 11.That's the general rule of prime vs. not prime. As you can see, it's too lengthy and excruciatingly painful to list ALL of the composites, because they are abundant.

Related questions

It is: 4001

Do you mean the digits 1,4,0? 401 is the only prime with just the digits 1, 4 and 0.

The least 1 digit number that is composite is 4. It is because all numbers before that are prime.

there are 4

1009

It is: 1013

532

You had me until "product." The product of 4 digits can't be prime.

there is more than a trillion

Numbers formed should be of at least 3 digits means they may be of 3 digits, 4 digits, 5 digits or 6 digits. There are 6 choices for digit in the units place. There are 5 and 4 choices for digits in ten and hundred’s place respectively. So, total number of ways by which 3 digits numbers can be formed = 6.5.4 = 120 Similarly, the total no.of ways by which 4 digits numbers can be formed = 6.5.4.3 = 360. the total no. of ways by which 5 digits numbers can be formed = 6.5.4.3.2 = 720. The total no.of ways by which 4 digits numbers can be formed = 6.5.4.3.2.1 = 720. So, total no.of ways by which the numbers of at least 3 digits can be formed = 120 + 360 + 720 + 720 = 1920.

There are only 4 prime digits: 2, 3, 5 and 7.There are only 4 prime digits: 2, 3, 5 and 7.There are only 4 prime digits: 2, 3, 5 and 7.There are only 4 prime digits: 2, 3, 5 and 7.

4

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