It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 637 988 is not a prime number.
For example, 637 988 can be divided by 2: 637 988 / 2 = 318 994.
For 637 988 to be a prime number, it would have been required that 637 988 has only two divisors, i.e., itself and 1.
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637 988 is an even number, because it is evenly divisible by 2: 637 988 / 2 = 318 994.
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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 637 988 is about 798.742.
Thus, the square root of 637 988 is not an integer, and therefore 637 988 is not a square number.
The square of a number (here 637 988) is the result of the product of this number (637 988) by itself (i.e., 637 988 × 637 988); the square of 637 988 is sometimes called "raising 637 988 to the power 2", or "637 988 squared".
The square of 637 988 is 407 028 688 144 because 637 988 × 637 988 = 637 9882 = 407 028 688 144.
As a consequence, 637 988 is the square root of 407 028 688 144.
The multiples of 637 988 are all integers evenly divisible by 637 988, that is all numbers such that the remainder of the division by 637 988 is zero. There are infinitely many multiples of 637 988. The smallest multiples of 637 988 are: