It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 126 004 is not a prime number.
For example, 126 004 can be divided by 2: 126 004 / 2 = 63 002.
For 126 004 to be a prime number, it would have been required that 126 004 has only two divisors, i.e., itself and 1.
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126 004 is an even number, because it is evenly divisible by 2: 126 004 / 2 = 63 002.
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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 126 004 is about 354.970.
Thus, the square root of 126 004 is not an integer, and therefore 126 004 is not a square number.
The square of a number (here 126 004) is the result of the product of this number (126 004) by itself (i.e., 126 004 × 126 004); the square of 126 004 is sometimes called "raising 126 004 to the power 2", or "126 004 squared".
The square of 126 004 is 15 877 008 016 because 126 004 × 126 004 = 126 0042 = 15 877 008 016.
As a consequence, 126 004 is the square root of 15 877 008 016.
The multiples of 126 004 are all integers evenly divisible by 126 004, that is all numbers such that the remainder of the division by 126 004 is zero. There are infinitely many multiples of 126 004. The smallest multiples of 126 004 are: