It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 201 721 is not a prime number.
For example, 201 721 can be divided by 13: 201 721 / 13 = 15 517.
For 201 721 to be a prime number, it would have been required that 201 721 has only two divisors, i.e., itself and 1.
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201 721 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 201 721 is about 449.134.
Thus, the square root of 201 721 is not an integer, and therefore 201 721 is not a square number.
The square of a number (here 201 721) is the result of the product of this number (201 721) by itself (i.e., 201 721 × 201 721); the square of 201 721 is sometimes called "raising 201 721 to the power 2", or "201 721 squared".
The square of 201 721 is 40 691 361 841 because 201 721 × 201 721 = 201 7212 = 40 691 361 841.
As a consequence, 201 721 is the square root of 40 691 361 841.
The multiples of 201 721 are all integers evenly divisible by 201 721, that is all numbers such that the remainder of the division by 201 721 is zero. There are infinitely many multiples of 201 721. The smallest multiples of 201 721 are: