It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 637 216 is not a prime number.
For example, 637 216 can be divided by 2: 637 216 / 2 = 318 608.
For 637 216 to be a prime number, it would have been required that 637 216 has only two divisors, i.e., itself and 1.
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637 216 is an even number, because it is evenly divisible by 2: 637 216 / 2 = 318 608.
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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 637 216 is about 798.258.
Thus, the square root of 637 216 is not an integer, and therefore 637 216 is not a square number.
The square of a number (here 637 216) is the result of the product of this number (637 216) by itself (i.e., 637 216 × 637 216); the square of 637 216 is sometimes called "raising 637 216 to the power 2", or "637 216 squared".
The square of 637 216 is 406 044 230 656 because 637 216 × 637 216 = 637 2162 = 406 044 230 656.
As a consequence, 637 216 is the square root of 406 044 230 656.
The multiples of 637 216 are all integers evenly divisible by 637 216, that is all numbers such that the remainder of the division by 637 216 is zero. There are infinitely many multiples of 637 216. The smallest multiples of 637 216 are: