It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 641 637 is not a prime number.
For example, 641 637 can be divided by 3: 641 637 / 3 = 213 879.
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For 641 637 to be a prime number, it would have been required that 641 637 has only two divisors, i.e., itself and 1.
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641 637 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 641 637 is about 801.022.
Thus, the square root of 641 637 is not an integer, and therefore 641 637 is not a square number.
The square of a number (here 641 637) is the result of the product of this number (641 637) by itself (i.e., 641 637 × 641 637); the square of 641 637 is sometimes called "raising 641 637 to the power 2", or "641 637 squared".
The square of 641 637 is 411 698 039 769 because 641 637 × 641 637 = 641 6372 = 411 698 039 769.
As a consequence, 641 637 is the square root of 411 698 039 769.
The multiples of 641 637 are all integers evenly divisible by 641 637, that is all numbers such that the remainder of the division by 641 637 is zero. There are infinitely many multiples of 641 637. The smallest multiples of 641 637 are: