No. Numbers are like words, and digits are like letters. A single numeric character is a digit. A single digit or character stands for a number of that value, just as you can have a one-letter word.
There are only ten digits in all: 0 1 2 3 4 5 6 7 8 9. They can be arranged in any combination and quantity, and the result is a number--a grouping of symbols that represents a value. 2, 79, 8407, and 91827365149307 are all numbers, and each of them is made up of digits. Only the first of those is both a number and a digit.
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This cannot be answered. This will have to be written to where it can be understood.
I assume you mean how many 4-digit numbers can be made from a set such as {A,A, B, C} where A, B and C are single digits. There are 12 such numbers.
There are 900 of them.
If I understand the question correctly, the digits 1, 2, 3, 4 and 5 appear the same number of times.