It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 126 423 is not a prime number.
For example, 1 126 423 can be divided by 353: 1 126 423 / 353 = 3 191.
For 1 126 423 to be a prime number, it would have been required that 1 126 423 has only two divisors, i.e., itself and 1.
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1 126 423 is an odd number, because it is not evenly divisible by 2.
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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 1 126 423 is about 1 061.331.
Thus, the square root of 1 126 423 is not an integer, and therefore 1 126 423 is not a square number.
The square of a number (here 1 126 423) is the result of the product of this number (1 126 423) by itself (i.e., 1 126 423 × 1 126 423); the square of 1 126 423 is sometimes called "raising 1 126 423 to the power 2", or "1 126 423 squared".
The square of 1 126 423 is 1 268 828 774 929 because 1 126 423 × 1 126 423 = 1 126 4232 = 1 268 828 774 929.
As a consequence, 1 126 423 is the square root of 1 268 828 774 929.
The multiples of 1 126 423 are all integers evenly divisible by 1 126 423, that is all numbers such that the remainder of the division by 1 126 423 is zero. There are infinitely many multiples of 1 126 423. The smallest multiples of 1 126 423 are: