It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 2 100 421 is not a prime number.
For example, 2 100 421 can be divided by 43: 2 100 421 / 43 = 48 847.
For 2 100 421 to be a prime number, it would have been required that 2 100 421 has only two divisors, i.e., itself and 1.
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2 100 421 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 2 100 421 is about 1 449.283.
Thus, the square root of 2 100 421 is not an integer, and therefore 2 100 421 is not a square number.
The square of a number (here 2 100 421) is the result of the product of this number (2 100 421) by itself (i.e., 2 100 421 × 2 100 421); the square of 2 100 421 is sometimes called "raising 2 100 421 to the power 2", or "2 100 421 squared".
The square of 2 100 421 is 4 411 768 377 241 because 2 100 421 × 2 100 421 = 2 100 4212 = 4 411 768 377 241.
As a consequence, 2 100 421 is the square root of 4 411 768 377 241.
The multiples of 2 100 421 are all integers evenly divisible by 2 100 421, that is all numbers such that the remainder of the division by 2 100 421 is zero. There are infinitely many multiples of 2 100 421. The smallest multiples of 2 100 421 are: