It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 125 743 is not a prime number.
For example, 1 125 743 can be divided by 199: 1 125 743 / 199 = 5 657.
For 1 125 743 to be a prime number, it would have been required that 1 125 743 has only two divisors, i.e., itself and 1.
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1 125 743 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 1 125 743 is about 1 061.010.
Thus, the square root of 1 125 743 is not an integer, and therefore 1 125 743 is not a square number.
The square of a number (here 1 125 743) is the result of the product of this number (1 125 743) by itself (i.e., 1 125 743 × 1 125 743); the square of 1 125 743 is sometimes called "raising 1 125 743 to the power 2", or "1 125 743 squared".
The square of 1 125 743 is 1 267 297 302 049 because 1 125 743 × 1 125 743 = 1 125 7432 = 1 267 297 302 049.
As a consequence, 1 125 743 is the square root of 1 267 297 302 049.
The multiples of 1 125 743 are all integers evenly divisible by 1 125 743, that is all numbers such that the remainder of the division by 1 125 743 is zero. There are infinitely many multiples of 1 125 743. The smallest multiples of 1 125 743 are: