It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 374 789 is not a prime number.
For example, 2 374 789 can be divided by 571: 2 374 789 / 571 = 4 159.
For 2 374 789 to be a prime number, it would have been required that 2 374 789 has only two divisors, i.e., itself and 1.
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2 374 789 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 2 374 789 is about 1 541.035.
Thus, the square root of 2 374 789 is not an integer, and therefore 2 374 789 is not a square number.
The square of a number (here 2 374 789) is the result of the product of this number (2 374 789) by itself (i.e., 2 374 789 × 2 374 789); the square of 2 374 789 is sometimes called "raising 2 374 789 to the power 2", or "2 374 789 squared".
The square of 2 374 789 is 5 639 622 794 521 because 2 374 789 × 2 374 789 = 2 374 7892 = 5 639 622 794 521.
As a consequence, 2 374 789 is the square root of 5 639 622 794 521.
The multiples of 2 374 789 are all integers evenly divisible by 2 374 789, that is all numbers such that the remainder of the division by 2 374 789 is zero. There are infinitely many multiples of 2 374 789. The smallest multiples of 2 374 789 are: