It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 799 789 is not a prime number.
For example, 1 799 789 can be divided by 617: 1 799 789 / 617 = 2 917.
For 1 799 789 to be a prime number, it would have been required that 1 799 789 has only two divisors, i.e., itself and 1.
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1 799 789 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 1 799 789 is about 1 341.562.
Thus, the square root of 1 799 789 is not an integer, and therefore 1 799 789 is not a square number.
The square of a number (here 1 799 789) is the result of the product of this number (1 799 789) by itself (i.e., 1 799 789 × 1 799 789); the square of 1 799 789 is sometimes called "raising 1 799 789 to the power 2", or "1 799 789 squared".
The square of 1 799 789 is 3 239 240 444 521 because 1 799 789 × 1 799 789 = 1 799 7892 = 3 239 240 444 521.
As a consequence, 1 799 789 is the square root of 3 239 240 444 521.
The multiples of 1 799 789 are all integers evenly divisible by 1 799 789, that is all numbers such that the remainder of the division by 1 799 789 is zero. There are infinitely many multiples of 1 799 789. The smallest multiples of 1 799 789 are: