It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 637 789 is not a prime number.
For example, 637 789 can be divided by 17: 637 789 / 17 = 37 517.
For 637 789 to be a prime number, it would have been required that 637 789 has only two divisors, i.e., itself and 1.
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637 789 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 637 789 is about 798.617.
Thus, the square root of 637 789 is not an integer, and therefore 637 789 is not a square number.
The square of a number (here 637 789) is the result of the product of this number (637 789) by itself (i.e., 637 789 × 637 789); the square of 637 789 is sometimes called "raising 637 789 to the power 2", or "637 789 squared".
The square of 637 789 is 406 774 808 521 because 637 789 × 637 789 = 637 7892 = 406 774 808 521.
As a consequence, 637 789 is the square root of 406 774 808 521.
The multiples of 637 789 are all integers evenly divisible by 637 789, that is all numbers such that the remainder of the division by 637 789 is zero. There are infinitely many multiples of 637 789. The smallest multiples of 637 789 are: