Square root of 256 =
Prime factorization of 256 is
2×2×2×2×2×2×2×2
The square of a number contains every prime number twice.
So, the square root of 256 will contain 2×2×2×2=16
Alternate: 256=2×2×2×2×2×2×2×2
Make pairs of prime numbers
256=2×2×2×2×2×2×2×2 ↓ ↓ ↓ ↓√256= 2 × 2 × 2 × 2=16