Q: What 4 digit number has the factors 7 and 13?

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95

6849 and 0213

All numbers have factors. Some factors have one digit. The factors of 24 are 1, 2, 3, 4, 6, 8, 12, 24 The single digit factors of 24 are 1, 2, 3, 4, 6 and 8.

The squares of most 2 digit prime numbers. For example 2809, which is the square of 53, has 3 factors : 1, 53 and 2809 itself.

This is not true. Think about any 4 digit multiplied by 1. This remains a 4 digit. In the case of any 4 digit under 5000, multiplied by two would also be a 4 digit number

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The highest four digit number with 13 and 7 as common factors is 9919, which is equal to 13 x 763 and 7 x 1417.

abcabc=abc x 1001 1001 = 7 x 11 x 13 So such number as at least 4 prime factors: if abc is prime, then 4 factors only if abc is not prime then at least 4 factors

4 : with factors 1, 2 and 4

There are many 4 digit numbers having 3 and 11 as factors. One of them is 1089 whose factors are 3,3,11,11.

1620 is one.

95

9409

no 2 and 4 aren't factors of 13. 13 is a prime number.

the answer would seem to be ten.

9409

6849 and 0213

If factors include 1 and the number itself then the any number (n) with only 4 factors has to be the product of two prime numbers, p1 and p2. The factors are then n, p1, p2, and 1. The largest 3-digit number with only 4 factors is 998. The factors are 998, 499, 2 and 1