It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 20 004 is not a prime number.
For example, 20 004 can be divided by 2: 20 004 / 2 = 10 002.
For 20 004 to be a prime number, it would have been required that 20 004 has only two divisors, i.e., itself and 1.
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20 004 is an even number, because it is evenly divisible by 2: 20 004 / 2 = 10 002.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 20 004 is about 141.435.
Thus, the square root of 20 004 is not an integer, and therefore 20 004 is not a square number.
The square of a number (here 20 004) is the result of the product of this number (20 004) by itself (i.e., 20 004 × 20 004); the square of 20 004 is sometimes called "raising 20 004 to the power 2", or "20 004 squared".
The square of 20 004 is 400 160 016 because 20 004 × 20 004 = 20 0042 = 400 160 016.
As a consequence, 20 004 is the square root of 400 160 016.
The multiples of 20 004 are all integers evenly divisible by 20 004, that is all numbers such that the remainder of the division by 20 004 is zero. There are infinitely many multiples of 20 004. The smallest multiples of 20 004 are: