It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 126 402 is not a prime number.
For example, 126 402 can be divided by 2: 126 402 / 2 = 63 201.
For 126 402 to be a prime number, it would have been required that 126 402 has only two divisors, i.e., itself and 1.
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126 402 is an even number, because it is evenly divisible by 2: 126 402 / 2 = 63 201.
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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 126 402 is about 355.531.
Thus, the square root of 126 402 is not an integer, and therefore 126 402 is not a square number.
The square of a number (here 126 402) is the result of the product of this number (126 402) by itself (i.e., 126 402 × 126 402); the square of 126 402 is sometimes called "raising 126 402 to the power 2", or "126 402 squared".
The square of 126 402 is 15 977 465 604 because 126 402 × 126 402 = 126 4022 = 15 977 465 604.
As a consequence, 126 402 is the square root of 15 977 465 604.
The multiples of 126 402 are all integers evenly divisible by 126 402, that is all numbers such that the remainder of the division by 126 402 is zero. There are infinitely many multiples of 126 402. The smallest multiples of 126 402 are: