It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 121 609 is not a prime number.
For example, 1 121 609 can be divided by 17: 1 121 609 / 17 = 65 977.
For 1 121 609 to be a prime number, it would have been required that 1 121 609 has only two divisors, i.e., itself and 1.
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1 121 609 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 1 121 609 is about 1 059.060.
Thus, the square root of 1 121 609 is not an integer, and therefore 1 121 609 is not a square number.
The square of a number (here 1 121 609) is the result of the product of this number (1 121 609) by itself (i.e., 1 121 609 × 1 121 609); the square of 1 121 609 is sometimes called "raising 1 121 609 to the power 2", or "1 121 609 squared".
The square of 1 121 609 is 1 258 006 748 881 because 1 121 609 × 1 121 609 = 1 121 6092 = 1 258 006 748 881.
As a consequence, 1 121 609 is the square root of 1 258 006 748 881.
The multiples of 1 121 609 are all integers evenly divisible by 1 121 609, that is all numbers such that the remainder of the division by 1 121 609 is zero. There are infinitely many multiples of 1 121 609. The smallest multiples of 1 121 609 are: